docker-image.yml

name: Build & Push Docker Images

on:
  push:
    paths:
      - "salami/**/Dockerfile"
      - "salami/**/docker-compose.yml"
      - "salami/**/VERSION"
      - "salamibase/**/Dockerfile"
      - "salamibase/**/docker-compose.yml"
      - "salamibase/**/VERSION"
      
  workflow_dispatch:
    inputs:
      target:
        description: "Path to the Dockerfile (e.g. salami/grafana/12/debian-12/Dockerfile)"
        required: false
        type: string

permissions:
  packages: write
  contents: write

jobs:
  detect-and-build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v5

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Fetch full git history
        run: git fetch --prune --unshallow || true

      - name: Determine changed Dockerfiles
        id: changed
        if: github.event_name == 'push'
        run: |
          files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep 'Dockerfile' || true)
          files=$(echo "$files" | paste -sd "," -)
          echo "changed_files=$files" >> $GITHUB_OUTPUT

      - name: Build & Push changed images
        if: github.event_name == 'push' && steps.changed.outputs.changed_files != ''
        run: |
          owner=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          IFS=',' read -ra changed_files <<< "${{ steps.changed.outputs.changed_files }}"
          for file in "${changed_files[@]}"; do
            dir=$(dirname "$file")
            name=$(echo "$dir" | xargs | tr '/' '-' | tr -d ' ')
            version_file="$dir/VERSION"
            if [ -f "$version_file" ]; then
              version=$(cat "$version_file")
            else
              version="latest"
            fi
            image="ghcr.io/$owner/$name:$version"
            echo "Building and pushing $file as $image (multi-arch)"
            docker buildx build --platform linux/amd64 -t "$image" -t "ghcr.io/$owner/$name:latest" --push "$dir"
          done

     

      - name: Manual build & push
        if: github.event_name == 'workflow_dispatch' && inputs.target != ''
        run: |
          owner=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          dir=$(dirname "${{ inputs.target }}")
          name=$(echo "$dir" | xargs | tr '/' '-' | tr -d ' ')
          version_file="$dir/VERSION"
          if [ -f "$version_file" ]; then
            version=$(cat "$version_file")
          else
            version="latest"
          fi
          image="ghcr.io/$owner/$name:$version"
          echo "Building and pushing manual target ${{ inputs.target }} as $image (multi-arch)"
          docker buildx build --no-cache --platform linux/amd64,linux/arm64 -t "$image" -t "ghcr.io/$owner/$name:latest" --push "$dir"