docker.yml

name: Build and publish Docker images

on:
  push:
    branches: ['main']

env:
  REGISTRY: ghcr.io
  OWNER: ${{ github.repository_owner }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    # Build multiple containers; map Dockerfile stages to published image names
    strategy:
      matrix:
        include:
          - target-stage: backend
            image-name: survey-backend
          - target-stage: static
            image-name: survey-static

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.OWNER }}/${{ matrix.image-name }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          push: true
          target: ${{ matrix.target-stage }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}