build-and-push-shared.yml

# Move to ls1intum/.github/.github/workflows/build-and-push-docker-image.yml@main in the future
name: Build and Push Docker Image

on:
  workflow_call:
    inputs:
      image-name:
        type: string
        default: ${{ github.repository }}
        description: "The name for the docker image (Default: Repository name)"
      docker-file:
        type: string
        default: Dockerfile
        description: "The path to the Dockerfile (Default: ./Dockerfile)"
      docker-context:
        type: string
        default: .
        description: "The context for the Docker build (Default: .)"
      build-args:
        type: string
        description: "List of additional build contexts (e.g., name=path)"
        required: false
      platforms:
        type: string
        description: "List of platforms for which to build the image"
        default: linux/amd64,linux/arm64
      registry:
        type: string
        default: ghcr.io
        description: "The registry to push the image to (Default: ghcr.io)"
      
    secrets:
      registry-user:
        required: false
      registry-password:
        required: false
    
    outputs:
      image-tag:
        description: "The tag of the pushed image"
        value: ${{ jobs.build.outputs.image-tag }}
jobs:
  build:
    name: Build Docker Image for ${{ inputs.image-name }}
    runs-on: ubuntu-latest
    outputs:
      image-tag: ${{ steps.set-tag.outputs.image-tag }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: all
  
      - name: Install Docker Buildx
        uses: docker/setup-buildx-action@v3

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

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ inputs.registry }}/${{ inputs.image-name }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=sha,prefix=,format=long

      - name: Set image tag output
        id: set-tag
        run: echo "image-tag=${{ steps.meta.outputs.version }}" >> $GITHUB_OUTPUT

      - name: Build and push Docker Image
        uses: docker/build-push-action@v6
        with:
          context: ${{ inputs.docker-context }}
          file: ${{ inputs.docker-file }}
          platforms: ${{ inputs.platforms }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: ${{ inputs.build-args }}
          push: true