dynamic-service-build.yml

name: Dynamic Service Docker Builds
on:
  push:
    branches:
      - main
    paths-ignore:
      - "deployment/**"
      - "gef-portal-scraper/**"
      - "**.md"
  pull_request:
    branches:
      - main
    paths-ignore:
      - "deployment/**"
      - "gef-portal-scraper/**"
      - "**.md"

jobs:
  detect_changes:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - name: Check out repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v40

      - name: Display all changed files
        run: |
          echo "🔍 Changed files in this push/PR:"
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
            echo "  → $file"
          done

      - name: Set up build matrix
        id: set-matrix
        run: |
          # Initialize variables
          MATRIX="["
          SEPARATOR=""
          # List of directories to exclude (space-separated)
          EXCLUDED_DIRS="deployment resources gef-portal-scraper"

          # Find all Dockerfiles in service directories
          for dockerfile in $(find . -name "Dockerfile" -not -path "*/\.*"); do
            # Get service directory (parent of Dockerfile)
            service_dir=$(dirname "$dockerfile")
            service_name=$(basename "$service_dir")
            
            # Skip if directory is in excluded list
            skip=false
            for excluded in $EXCLUDED_DIRS; do
              if [[ "$service_dir" == *"$excluded"* ]]; then
                skip=true
                echo "⏭️ Skipping excluded directory: $service_dir"
                break
              fi
            done
            [ "$skip" = true ] && continue
            
            # Check for changes in service directory
            CHANGED=false
            for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
              if [[ $file == $service_dir/* ]]; then
                CHANGED=true
                echo "✨ Found changes in service: $service_name"
                echo "  Changed file: $file"
                break
              fi
            done
            
            # If changes detected, add to build matrix
            if [ "$CHANGED" = true ]; then
              echo "🔨 Adding $service_name to build matrix"
              MATRIX="${MATRIX}${SEPARATOR}{\"service\": \"${service_name}\", \"context\": \"${service_dir#./}\"}"
              SEPARATOR=","
            else
              echo "⏭️ No changes detected for $service_name - skipping"
            fi
          done

          MATRIX="${MATRIX}]"

          echo "📊 Final build matrix:"
          echo "$MATRIX" | jq '.'

          if [ "$MATRIX" = "[]" ]; then
            echo "⚠️ No services to build"
            echo "matrix=[]" >> $GITHUB_OUTPUT
          else
            echo "🚀 Services ready for build"
            echo "matrix=$MATRIX" >> $GITHUB_OUTPUT
          fi

  build_and_push:
    needs: detect_changes
    if: ${{ needs.detect_changes.outputs.matrix != '[]' }}
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    strategy:
      matrix:
        include: ${{ fromJson(needs.detect_changes.outputs.matrix) }}
    steps:
      - name: Check out repository
        uses: actions/checkout@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Define lowercase repository owner
        id: repo
        run: |
          echo "REPO_OWNER_LC=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: Display build information
        run: |
          echo "🏗️ Building service: ${{ matrix.service }}"
          echo "  • Context: ${{ matrix.context }}"
          echo "  • Image name: ghcr.io/${{ env.REPO_OWNER_LC }}/${{ matrix.service }}:latest"

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: ./${{ matrix.context }}
          file: ./${{ matrix.context }}/Dockerfile
          push: true
          tags: ghcr.io/${{ env.REPO_OWNER_LC }}/${{ matrix.service }}:latest

      - name: Build status
        run: |
          echo "✅ Successfully built and pushed: ghcr.io/${{ env.REPO_OWNER_LC }}/${{ matrix.service }}:latest"