build_docker.yml

name: Build Docker Image

on:
  workflow_call:
    outputs:
      server_image_tag: 
        description: "The tag of the server image that was built"
        value: ${{ jobs.build.outputs.server_image_tag }}
      client_image_tag: 
        description: "The tag of the client image that was built"
        value: ${{ jobs.build.outputs.client_image_tag }}

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - dockerfile: ./client.Dockerfile
            image: ghcr.io/ls1intum/thesis-track/thesis-track-client
            context: ./
            path: client
          - dockerfile: ./server.Dockerfile
            image: ghcr.io/ls1intum/thesis-track/thesis-track-server
            context: ./
            path: server
    outputs:
      server_image_tag: "${{ steps.output-tag-server.outputs.server_image_tag }}"
      client_image_tag: "${{ steps.output-tag-client.outputs.client_image_tag }}"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      - name: Get changed files in the client folder
        id: changed-files-client-folder
        uses: tj-actions/changed-files@v45
        with:
          files: client/**

      - name: Get changed files in the server folder
        id: changed-files-server-folder
        uses: tj-actions/changed-files@v45
        with:
          files: server/**

      - name: Log in to the Container registry
        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-server-folder.outputs.any_changed == 'true') }}
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up QEMU
        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-server-folder.outputs.any_changed == 'true') }}
        uses: docker/setup-qemu-action@v3
        with:
          platforms: all

      - name: Install Docker Buildx
        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true') || (steps.changed-files-server-folder.outputs.any_changed == 'true') }}
        id: buildx
        uses: docker/setup-buildx-action@v3

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ matrix.image }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=ref,event=branch
            type=ref,event=pr

      - name: Build and push Docker Image
        uses: docker/build-push-action@v5
        if: ${{ (steps.changed-files-client-folder.outputs.any_changed == 'true' && matrix.path == 'client') || (steps.changed-files-server-folder.outputs.any_changed == 'true' && matrix.path == 'server') }}
        with:
          context: ${{ matrix.context }}
          file: ${{ matrix.dockerfile }}
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}

      - id: output-tag-client
        run: |
          if [[ "${{ matrix.path }}" == "client" ]] && [[ "${{ steps.changed-files-client-folder.outputs.any_changed }}" == "true" ]]; then
            echo "client_image_tag=${{ steps.meta.outputs.version }}" >> "$GITHUB_OUTPUT"
          elif [[ "${{ matrix.path }}" == "client" ]]; then
            echo "client_image_tag=latest" >> "$GITHUB_OUTPUT"
          fi
      
      - id: output-tag-server
        run: |
          if [[ "${{ matrix.path }}" == "server" ]] && [[ "${{ steps.changed-files-server-folder.outputs.any_changed }}" == "true" ]]; then
            echo "server_image_tag=${{ steps.meta.outputs.version }}" >> "$GITHUB_OUTPUT"
          elif [[ "${{ matrix.path }}" == "server" ]]; then
            echo "server_image_tag=latest" >> "$GITHUB_OUTPUT"
          fi