name: Docker build

on:
  push:
    tags: ['*']
    branches: [ 'main', 'stable-*' ]
  pull_request:
    branches: [ 'main', 'stable-*' ]


jobs:
  test:
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Test image # Checks we are able to run the container.
        run: docker compose -f docker-compose.test.yml run sut

  build_upload:
    runs-on: ubuntu-22.04
    needs: test
    if: github.event_name != 'pull_request'
    steps:
      - name: Checkout
        uses: actions/checkout@v2

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

      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ${{ secrets.DOCKERHUB_ORGANISATION }}/${{ secrets.DOCKERHUB_REPOSITORY }}

      - uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: ./
          file: ./Dockerfile
          builder: ${{ steps.buildx.outputs.name }}
          push: true
          labels: ${{ steps.meta.outputs.labels }}
          tags: ${{ steps.meta.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache
          platforms: linux/amd64,linux/arm64,linux/arm/v7

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}