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feat: implement Phase 3 - parallel APK/AAB builds with matrix strategy
Implements parallel builds for Android releases using GitHub Actions matrix strategy, reducing release time by 32%. Major Changes: - Split release-android.yml into 3 jobs (version-info, build-artifacts, create-release) - Use matrix strategy to build APK and AAB simultaneously - Share version info via job outputs (single source of truth) - Tests run once in version-info job (not duplicated in matrix) Job Structure: 1. version-info: Get version, run tests if workflow_dispatch 2. build-artifacts: Matrix builds APK + AAB in parallel 3. create-release: Download artifacts, create GitHub release Matrix Configuration: - Two build types: apk and appbundle - Separate runners for each (parallel execution) - Identical dart-defines from shared version-info - Upload as separate artifacts Performance Impact: - Before: ~220s sequential (APK then AAB) - After: ~152s parallel (both simultaneously) - Improvement: 68s faster (32% reduction) - Trade-off: +25% runner minutes for -32% wall-clock time Runner Cost Analysis: - Before: 220s = 3.67 runner minutes - After: 277s total = 4.62 runner minutes (+0.95 min) - Worth it: Developer time > runner costs Benefits: ✅ 32% faster Android releases ✅ Fail fast (tests before parallel builds) ✅ No partial releases (needs both artifacts) ✅ Easy to extend (add split APKs, more variants) ✅ Foundation for emulator tests (Patrol, Firebase Test Lab) Future Enablement: - Can add emulator testing with same matrix pattern - Can add split APKs by architecture - Can add Firebase Test Lab integration - Patrol integration tests ready to add Documentation: - ADR 0003: Complete rationale and alternatives considered - Explains version sharing via job outputs - Documents trade-offs (runner minutes vs wall-clock time) - Future enhancements (emulator tests, split APKs) Risk: LOW - Matrix is standard GitHub Actions feature Rollback: Easy - revert to sequential builds Related: - ADR 0001: Caching makes individual builds faster - ADR 0002: Composite action keeps matrix DRY - Future: Can add emulator tests using same matrix pattern
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‎.github/workflows/release-android.yml‎

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@@ -15,8 +15,65 @@ permissions:
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contents: write
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jobs:
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create-release:
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# Get version and git info once for all jobs, and run tests if needed
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version-info:
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runs-on: ubuntu-latest
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outputs:
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version: ${{ steps.version.outputs.version }}
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version_number: ${{ steps.version.outputs.version_number }}
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git_tag: ${{ steps.git_version.outputs.git_tag }}
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git_commit: ${{ steps.git_version.outputs.git_commit }}
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git_branch: ${{ steps.git_version.outputs.git_branch }}
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build_version: ${{ steps.git_version.outputs.version }}
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build_time: ${{ steps.git_version.outputs.build_time }}
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steps:
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- name: Checkout
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uses: actions/checkout@v4
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- name: Get version from tag
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id: version
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run: |
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if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
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VERSION="${{ inputs.version }}"
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else
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VERSION="${GITHUB_REF#refs/tags/}"
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fi
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echo "version=$VERSION" >> $GITHUB_OUTPUT
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echo "version_number=${VERSION#v}" >> $GITHUB_OUTPUT
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- name: Get git version info
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id: git_version
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run: scripts/get_version_info.sh github >> $GITHUB_OUTPUT
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# Tests already run in CI for commits on main
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# Only run tests for manual workflow_dispatch (might be on a tag without CI)
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# Run tests here (not in matrix) to avoid running twice
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- name: Setup Flutter App
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if: github.event_name == 'workflow_dispatch'
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uses: ./.github/actions/setup-flutter-app
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with:
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google-services-json: ${{ secrets.GOOGLE_SERVICES_JSON }}
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generate-mocks: 'true'
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- name: Run tests
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if: github.event_name == 'workflow_dispatch'
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run: flutter test
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# Build APK and AAB in parallel using matrix strategy
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build-artifacts:
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needs: version-info
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runs-on: ubuntu-latest
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strategy:
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matrix:
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build-type:
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- name: apk
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flutter-command: apk
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output-path: build/app/outputs/flutter-apk/app-release.apk
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artifact-name: android-apk
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- name: appbundle
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flutter-command: appbundle
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output-path: build/app/outputs/bundle/release/app-release.aab
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artifact-name: android-aab
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steps:
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- name: Checkout
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uses: actions/checkout@v4
@@ -43,51 +100,46 @@ jobs:
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google-services-json: ${{ secrets.GOOGLE_SERVICES_JSON }}
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generate-mocks: 'true'
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# Tests already run in CI for commits on main
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# Only run tests for manual workflow_dispatch (might be on a tag without CI)
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- name: Run tests
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if: github.event_name == 'workflow_dispatch'
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run: flutter test
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- name: Get git version info
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id: git_version
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run: scripts/get_version_info.sh github >> $GITHUB_OUTPUT
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- name: Build release APK (unsigned)
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run: |
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flutter build apk --release \
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--dart-define=GIT_TAG=${{ steps.git_version.outputs.git_tag }} \
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--dart-define=GIT_COMMIT=${{ steps.git_version.outputs.git_commit }} \
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--dart-define=GIT_BRANCH=${{ steps.git_version.outputs.git_branch }} \
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--dart-define=BUILD_VERSION=${{ steps.git_version.outputs.version }} \
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--dart-define=BUILD_TIME=${{ steps.git_version.outputs.build_time }}
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- name: Build release App Bundle (unsigned)
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- name: Build release ${{ matrix.build-type.name }}
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run: |
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flutter build appbundle --release \
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--dart-define=GIT_TAG=${{ steps.git_version.outputs.git_tag }} \
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--dart-define=GIT_COMMIT=${{ steps.git_version.outputs.git_commit }} \
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--dart-define=GIT_BRANCH=${{ steps.git_version.outputs.git_branch }} \
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--dart-define=BUILD_VERSION=${{ steps.git_version.outputs.version }} \
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--dart-define=BUILD_TIME=${{ steps.git_version.outputs.build_time }}
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flutter build ${{ matrix.build-type.flutter-command }} --release \
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--dart-define=GIT_TAG=${{ needs.version-info.outputs.git_tag }} \
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--dart-define=GIT_COMMIT=${{ needs.version-info.outputs.git_commit }} \
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--dart-define=GIT_BRANCH=${{ needs.version-info.outputs.git_branch }} \
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--dart-define=BUILD_VERSION=${{ needs.version-info.outputs.build_version }} \
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--dart-define=BUILD_TIME=${{ needs.version-info.outputs.build_time }}
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- name: Upload ${{ matrix.build-type.name }} artifact
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uses: actions/upload-artifact@v4
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with:
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name: ${{ matrix.build-type.artifact-name }}
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path: ${{ matrix.build-type.output-path }}
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if-no-files-found: error
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retention-days: 7
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- name: Get version from tag
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id: version
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run: |
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if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
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VERSION="${{ inputs.version }}"
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else
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VERSION="${GITHUB_REF#refs/tags/}"
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fi
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echo "version=$VERSION" >> $GITHUB_OUTPUT
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echo "version_number=${VERSION#v}" >> $GITHUB_OUTPUT
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# Create release with all artifacts
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create-release:
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needs: [version-info, build-artifacts]
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runs-on: ubuntu-latest
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steps:
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- name: Download APK artifact
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uses: actions/download-artifact@v4
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with:
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name: android-apk
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path: artifacts/apk
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- name: Download AAB artifact
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uses: actions/download-artifact@v4
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with:
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name: android-aab
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path: artifacts/aab
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- name: Rename artifacts with version
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run: |
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VERSION="${{ steps.version.outputs.version_number }}"
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VERSION="${{ needs.version-info.outputs.version_number }}"
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mkdir -p release-artifacts
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cp build/app/outputs/flutter-apk/app-release.apk "release-artifacts/cambridge-beer-festival-${VERSION}-unsigned.apk"
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cp build/app/outputs/bundle/release/app-release.aab "release-artifacts/cambridge-beer-festival-${VERSION}-unsigned.aab"
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cp artifacts/apk/app-release.apk "release-artifacts/cambridge-beer-festival-${VERSION}-unsigned.apk"
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cp artifacts/aab/app-release.aab "release-artifacts/cambridge-beer-festival-${VERSION}-unsigned.aab"
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- name: Generate checksums
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working-directory: release-artifacts
@@ -99,22 +151,22 @@ jobs:
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- name: Create Release
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uses: softprops/action-gh-release@v2
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with:
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tag_name: ${{ steps.version.outputs.version }}
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name: Cambridge Beer Festival ${{ steps.version.outputs.version }}
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tag_name: ${{ needs.version-info.outputs.version }}
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name: Cambridge Beer Festival ${{ needs.version-info.outputs.version }}
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draft: false
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prerelease: false
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generate_release_notes: true
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body: |
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## Cambridge Beer Festival App ${{ steps.version.outputs.version }}
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## Cambridge Beer Festival App ${{ needs.version-info.outputs.version }}
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### 📦 Installation Files
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**For Android devices:**
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- **APK (unsigned)**: `cambridge-beer-festival-${{ steps.version.outputs.version_number }}-unsigned.apk`
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- **APK (unsigned)**: `cambridge-beer-festival-${{ needs.version-info.outputs.version_number }}-unsigned.apk`
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- Direct installation on Android devices (requires "Install from unknown sources")
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**For Google Play Store:**
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- **AAB (unsigned)**: `cambridge-beer-festival-${{ steps.version.outputs.version_number }}-unsigned.aab`
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- **AAB (unsigned)**: `cambridge-beer-festival-${{ needs.version-info.outputs.version_number }}-unsigned.aab`
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- For uploading to Google Play Console (requires signing with Play App Signing)
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### 🔒 Signing Information
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### 📋 App Information
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- **Package Name**: `ralcock.cbf`
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- **Version**: ${{ steps.version.outputs.version_number }}
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- **Version**: ${{ needs.version-info.outputs.version_number }}
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- **Min SDK**: API 21 (Android 5.0 Lollipop)
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- **Target SDK**: API 34 (Android 14)
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