build-test.yml

name: Docker Image Build

on:
  push:
    branches: [ master ]
    paths:
      - '*/Dockerfile'
      - '.github/workflows/build-test.yml'
  pull_request:
    branches: [ master ]
    paths:
      - '*/Dockerfile'
      - '.github/workflows/build-test.yml'      

jobs:
  files:
    runs-on: ubuntu-latest

    outputs:
      matrix: ${{ steps.dockerfile.outputs.matrix }}

    steps:
    - name: Checkout repository
      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
      with:
        fetch-depth: 0

    - name: Get changed files
      id: files
      uses: jitterbit/get-changed-files@b17fbb00bdc0c0f63fcf166580804b4d2cdc2a42 # v1
      with:
        format: json

    - name: Extract Dockerfile files
      id: dockerfile
      run: |
        FILES=$( echo '${{ steps.files.outputs.added_modified }}' | jq -c 'map(select(. | endswith("Dockerfile")))' )
        echo "matrix=$FILES" >> "$GITHUB_OUTPUT"

  build:
    runs-on: ubuntu-latest
    needs: files

    strategy:
      fail-fast: false
      matrix:
        dockerfile: ${{ fromJSON(needs.files.outputs.matrix) }}

    steps:
    - name: Checkout repository
      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

    - name: Set up QEMU
      uses: docker/setup-qemu-action@53851d14592bedcffcf25ea515637cff71ef929a # v3.3.0

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@6524bf65af31da8d45b59e8c27de4bd072b392f5 # v3.8.0    

    - name: Build Docker image ${{ matrix.dockerfile }}
      run: |
        cd "$(dirname ${{ matrix.dockerfile }})"
        docker buildx build --platform linux/amd64,linux/arm64 . --file Dockerfile