build-and-publish-image.yml

# This workflow uses actions that are not certified by GitHub.  
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.  

name: Build and publish Docker image

on:
  workflow_dispatch:
  pull_request:
    branches: ["main","devel"]
    types: [closed]
    paths:
      - '.github/workflows/build-and-publish-image.yml'
      - 'Dockerfile'
      - 'reinstall-cmake.sh'
      - 'VERSION'
  

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    if: ${{github.event_name == 'pull_request' && github.event.action == 'closed' && github.event.pull_request.merged == true}}
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Extract version number
        run: |
          VER=$(cat VERSION)
          echo "VERSION=$VER" >> $GITHUB_ENV

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

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{ env.VERSION }}
            type=sha

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
          build-args: |
            CONTAINER_VERSION=${{ env.VERSION }}
          labels: ${{ steps.meta.outputs.labels }}