server.yml

name: server

on:
  workflow_dispatch:
  workflow_call:
    outputs:
      image_tag:
        description: Immutable image tag for this workflow run
        value: ${{ jobs.push_merge.outputs.image_tag }}

permissions:
  contents: read
  packages: write

env:
  IMAGE: ghcr.io/${{ github.repository_owner }}/server
  RUNNER_AMD64: &runner_amd64 blacksmith-4vcpu-ubuntu-2404
  RUNNER_ARM64: &runner_arm64 blacksmith-4vcpu-ubuntu-2404-arm

concurrency:
  group: "server @ ${{ github.event_name }} @ ${{ github.ref_name }}"
  cancel-in-progress: true

jobs:
  build_per_arch:
    strategy:
      fail-fast: false
      matrix:
        include:
          - arch: amd64
            runner: *runner_amd64
            platform: linux/amd64
          - arch: arm64
            runner: *runner_arm64
            platform: linux/arm64
    runs-on:
      - ${{ matrix.runner }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          submodules: true
          fetch-depth: 1

      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - name: Setup Blacksmith Builder
        uses: useblacksmith/setup-docker-builder@v1

      - name: Docker meta (server)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push by digest (server)
        id: build
        uses: useblacksmith/build-push-action@v2
        with:
          context: ${{ github.workspace }}
          file: .github/workflows/server-Dockerfile
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          tags: ${{ env.IMAGE }}
          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
          provenance: false

      - name: Export digest (server)
        run: |
          mkdir -p ${{ runner.temp }}/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest (server)
        uses: actions/upload-artifact@v4
        with:
          name: server-digests-${{ matrix.arch }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

  push_merge:
    runs-on: *runner_amd64
    needs: build_per_arch
    outputs:
      image_tag: ${{ steps.expose.outputs.tag }}
    steps:
      - name: Download digests (server)
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          pattern: server-digests-*
          merge-multiple: true

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Setup Blacksmith Builder
        uses: useblacksmith/setup-docker-builder@v1

      - name: Docker meta (server)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE }}
          tags: |
            type=ref,event=branch
            type=ref,event=tag
            type=raw,value=${{ github.ref_name }}-${{ github.sha }}
            type=raw,value=dev,enable=${{ github.ref == 'refs/heads/dev' }}

      - name: Generate additional version tags (server)
        id: version_tags
        if: startsWith(github.ref, 'refs/tags/') && !contains(github.ref_name, '-')
        run: |
          VERSION=${GITHUB_REF#refs/tags/}
          VERSION=${VERSION#v}
          IFS='.' read -r -a parts <<< "$VERSION"

          ADDITIONAL_TAGS=""
          if [ ${#parts[@]} -ge 1 ]; then
            ADDITIONAL_TAGS="${{ env.IMAGE }}:v${parts[0]}"
          fi
          if [ ${#parts[@]} -ge 2 ]; then
            ADDITIONAL_TAGS="$ADDITIONAL_TAGS,${{ env.IMAGE }}:v${parts[0]}.${parts[1]}"
          fi
          if [ ${#parts[@]} -ge 3 ]; then
            ADDITIONAL_TAGS="$ADDITIONAL_TAGS,${{ env.IMAGE }}:v${parts[0]}.${parts[1]}.${parts[2]}"
          fi
          if [ ${#parts[@]} -ge 4 ]; then
            ADDITIONAL_TAGS="$ADDITIONAL_TAGS,${{ env.IMAGE }}:v${parts[0]}.${parts[1]}.${parts[2]}.${parts[3]}"
          fi

          echo "additional_tags=$ADDITIONAL_TAGS" >> $GITHUB_OUTPUT
          echo "Generated additional tags: $ADDITIONAL_TAGS"

      - name: Create manifest list and push (server)
        working-directory: ${{ runner.temp }}/digests
        run: |
          set -euo pipefail

          shopt -s nullglob
          digests=( *)
          shopt -u nullglob

          if [ ${#digests[@]} -eq 0 ]; then
            echo "No server digest artifacts were downloaded; cannot create a multi-arch manifest." >&2
            exit 1
          fi

          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.IMAGE }}@sha256:%s ' "${digests[@]}")

          if [ -n "${{ steps.version_tags.outputs.additional_tags }}" ]; then
            IFS=',' read -r -a additional_tags <<< "${{ steps.version_tags.outputs.additional_tags }}"
            for tag in "${additional_tags[@]}"; do
              if [ -n "$tag" ]; then
                echo "Creating manifest for additional tag: $tag"
                docker buildx imagetools create -t "$tag" \
                  $(printf '${{ env.IMAGE }}@sha256:%s ' "${digests[@]}")
              fi
            done
          fi

      - name: Inspect image (server)
        run: |
          docker buildx imagetools inspect ${{ env.IMAGE }}:${{ steps.meta.outputs.version }}

      - name: Expose immutable image tag
        id: expose
        run: echo "tag=${{ github.ref_name }}-${{ github.sha }}" >> $GITHUB_OUTPUT