containers.yaml

name: Build and publish container image
# on:
#
#   # publish on releases, e.g. v2.1.13 (image tagged as "2.1.13" - "v" prefix is removed)
#   release:
#     types: [ published ]
#
#   # publish on pushes to the main branch (image tagged as "latest")
#   push:
#     branches:
#       - main
#
# jobs:
#   docker_publish:
#     permissions: 
#       packages: write
#     runs-on: "ubuntu-20.04"
#
#     steps:
#       - uses: actions/checkout@v2
#
#       # https://github.com/marketplace/actions/push-to-ghcr
#       - name: Build and publish a Docker image for ${{ github.repository }}
#         uses: macbre/push-to-ghcr@master
#         with:
#           image_name: ${{ github.repository }}  # it will be lowercased internally
#           github_token: ${{ secrets.GITHUB_TOKEN }}

on:
  push:

env:
  REGISTRY_IMAGE: ghcr.io/${{ github.repository }}

jobs:
  prepare:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.platforms.outputs.matrix }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      
      - name: Create matrix
        id: platforms
        run: |
          echo "matrix=$(docker buildx bake image-all --print | jq -cr '.target."image-all".platforms')" >>${GITHUB_OUTPUT}
      
      - name: Show matrix
        run: |
          echo ${{ steps.platforms.outputs.matrix }}
      
      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
      
      - name: Rename meta bake definition file
        run: |
          mv "${{ steps.meta.outputs.bake-file }}" "/tmp/bake-meta.json"
      
      - name: Upload meta bake definition
        uses: actions/upload-artifact@v4
        with:
          name: bake-meta
          path: /tmp/bake-meta.json
          if-no-files-found: error
          retention-days: 1

  build:
    runs-on: ubuntu-latest
    needs:
      - prepare
    strategy:
      fail-fast: false
      matrix:
        platform: ${{ fromJson(needs.prepare.outputs.matrix) }}
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
      
      - name: Checkout
        uses: actions/checkout@v4
      
      - name: Download meta bake definition
        uses: actions/download-artifact@v4
        with:
          name: bake-meta
          path: /tmp
      
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      
      # - name: Login to Docker Hub
      #   uses: docker/login-action@v3
      #   with:
      #     username: ${{ vars.DOCKERHUB_USERNAME }}
      #     password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: 'Login to GitHub Container Registry'
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo $GITHUB_TOKEN | docker login ghcr.io -u "${{ github.actor }}" --password-stdin

      
      - name: Build
        id: bake
        uses: docker/bake-action@v5
        with:
          files: |
            ./docker-bake.hcl
            /tmp/bake-meta.json
          targets: image
          set: |
            *.tags=
            *.platform=${{ matrix.platform }}
            *.output=type=image,"name=${{ env.REGISTRY_IMAGE }}",push-by-digest=true,name-canonical=true,push=true
      
      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ fromJSON(steps.bake.outputs.metadata).image['containerimage.digest'] }}"
          touch "/tmp/digests/${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 meta bake definition
        uses: actions/download-artifact@v4
        with:
          name: bake-meta
          path: /tmp
      
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      
      # - name: Login to DockerHub
      #   uses: docker/login-action@v3
      #   with:
      #     username: ${{ vars.DOCKERHUB_USERNAME }}
      #     password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: 'Login to GitHub Container Registry'
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo $GITHUB_TOKEN | docker login ghcr.io -u "${{ github.actor }}" --password-stdin

      
      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.target."docker-metadata-action".tags | map(select(startswith("${{ env.REGISTRY_IMAGE }}")) | "-t " + .) | join(" ")' /tmp/bake-meta.json) \
            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
      
      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:$(jq -r '.target."docker-metadata-action".args.DOCKER_META_VERSION' /tmp/bake-meta.json)