build.yml

name: Test build

on: push

jobs:
  detect-changes:
    runs-on: ubuntu-latest
    outputs:
        # Expose matched filters as job 'variants' output variable
        image_variants: ${{ steps.filter.outputs.changes }}
    steps:
    - uses: actions/checkout@v3
    - uses: dorny/paths-filter@v2
      # https://github.com/marketplace/actions/paths-changes-filter#conditional-execution
      id: filter
      with:
        # detect changes against last commit
        base: ${{ github.ref }}
        filters: |
            Dockerfile: Dockerfile
            Dockerfile-deb: Dockerfile-deb
  build:
    needs: detect-changes
    name: Setup, Build
    runs-on: ubuntu-latest
    continue-on-error: true
    strategy:
        max-parallel: 6
        # select a core set of images to build
        matrix:
          IMAGE_VARIANT: ${{ fromJSON(needs.detect-changes.outputs.image_variants) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      # Build the Docker image
      - name: Build
        run: |
          docker build -f ${{ matrix.IMAGE_VARIANT }} .