name: build and publish container image
on:
  push:
    tags:
      - 'v*'

jobs:
  publish:
    strategy:
      matrix:
        docker-base-image: ["debian", "alpine"]
    runs-on: ubuntu-latest
    steps:       
      - name: Check out the repo
        uses: actions/checkout@v2

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}

      - name: Docker meta - debug
        id: metadebug
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}
          flavor: |
            latest=true
            suffix=-debug,onlatest=true

      - name: Docker meta - assertions
        id: metaassertions
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}
          flavor: |
            latest=true
            suffix=-assertions,onlatest=true        

      - name: Log in to GitHub Docker Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build container image - debug
        uses: docker/build-push-action@v2
        with:
          push: true
          platforms: linux/amd64,linux/arm64
          file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
          tags: ${{ steps.metadebug.outputs.tags  }}
          build-args: |
            DOCKER_TAG=${{ join(steps.metadebug.outputs.tags ) }}-${{ matrix.docker-base-image }}


      - name: Build container image - assertions
        uses: docker/build-push-action@v2
        with:
          push: true
          platforms: linux/amd64,linux/arm64
          file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
          tags: ${{ steps.metaassertions.outputs.tags  }}
          build-args: |
            DOCKER_TAG=${{ join(steps.metaassertions.outputs.tags ) }}-${{ matrix.docker-base-image }}

      # build and publish "normal" image as last to get it listed on top
      - name: Build container image - normal
        uses: docker/build-push-action@v2
        with:
          push: true
          platforms: linux/amd64,linux/arm64
          file: ./docker/Dockerfile-${{ matrix.docker-base-image }}
          tags: ${{ steps.meta.outputs.tags  }}
          build-args: |
            DOCKER_TAG=${{ join(steps.meta.outputs.tags ) }}-${{ matrix.docker-base-image }}