build-images.yml

name: Build and publish Docker images

on:
  push:
    branches:
      - main
      - devel
      - specky
    paths:
      - "env/*/Dockerfile"
      - "env/*/environment.yml"

env:
  REGISTRY: ghcr.io
  INCLUDE_DIR: "env/"
  REPOSITORY: ${{ github.repository }}

jobs:
  changed-directories:
    name: Get last directory name of changed files
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.changed-files.outputs.all_changed_files }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get changed files
        uses: tj-actions/changed-files@v45
        id: changed-files
        with:
          matrix: true
          dir_names: true
          path: ${{ env.INCLUDE_DIR }}
          dir_names_include_files: ${{ env.INCLUDE_DIR }}
          dir_names_exclude_current_dir: true

  build-and-push-image:
    name: Build and push Docker images
    runs-on: ubuntu-latest
    needs: changed-directories
    strategy:
      fail-fast: false
      matrix:
        name: ${{ fromJSON(needs.changed-directories.outputs.matrix) }}
        platform: [linux/amd64, linux/arm64]
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.REPOSITORY }}/${{ matrix.name }}
          tags: |
            type=raw,value=latest,enable=${{ endsWith(github.ref, github.event.repository.default_branch) }}
            type=ref,event=branch,enable=${{ !endsWith(github.ref, github.event.repository.default_branch) }}
          flavor: |
            latest=false

      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v6
        with:
          context: ${{ env.INCLUDE_DIR }}/${{ matrix.name }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          platforms: ${{ matrix.platform }}