Try building on CI

Author: CamJN

.github/workflows/main.yml

@@ -8,26 +8,108 @@ defaults:
   run:
     shell: bash
 
+env:
+  GHCR_REPO: ghcr.io/phusion/passenger_binary_build_automation
+
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        arch:
+          - platform: linux/amd64
+            runner: ubuntu-24.04
+          - platform: linux/arm64
+            runner: passenger-ubuntu-24.04-arm64-4cpu
+    runs-on: ${{ matrix.arch.runner }}
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Purge containers
-        run: 'docker kill $(docker ps -q) || exit 0'
-      - name: Enable docker multiarch
-        uses: docker/setup-qemu-action@v3
-      - name: "Run linux/setup-docker-images"
-        run: "./linux/setup-docker-images"
-      - name: Log in to the Container registry
-        if: ${{ github.event.pull_request.merged || github.actor == 'CamJN' }}
+      - name: Prepare
+        run: |
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+          echo "DOCKER_IMAGE_VERSION=$(cat "./shared/definitions/docker_image_version")" >> $GITHUB_ENV
+        env:
+          platform: ${{ matrix.arch.platform }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images:
+            - ${{ env.GHCR_REPO }}
+
+      - name: Login to GHCR
         uses: docker/login-action@v3
-        id: login
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Push to github container registry
-        if: ${{ success() && steps.login.conclusion != 'skipped' }}
-        run: "./linux/publish-docker-images"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          file: ./linux/docker_image/Dockerfile
+          platforms: ${{ matrix.arch.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: "type=image,name=${{ env.GHCR_REPO }},push-by-digest=true,name-canonical=true,push=true"
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.GHCR_REPO }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") $(printf '${{ env.GHCR_REPO }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: docker buildx imagetools inspect ${{ env.GHCR_REPO }}:${{ steps.meta.outputs.version }}