build_and_push_to_docker_hub.yml

name: Build Docker image and push to Docker Hub

on:
  release:
    types: [ published ]

jobs:
  build_and_push:
    name: Build a new Docker image for the release (and a latest) and push it to Docker Hub
    runs-on: ubuntu-latest

    steps:
      # https://github.com/actions/checkout
      - uses: actions/checkout@v4

      # https://github.com/docker/login-action
      - name: Log into Docker Hub
        if: github.event_name == 'release'
        uses: docker/login-action@v3
        with:
          registry: docker.io
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      # https://github.com/docker/metadata-action
      - name: Extract Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: signalen/backend
          flavor: |
            latest=${{ github.event_name == 'release' }} # generate 'latest' tag for releases

      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v5
        with:
          context: .
          target: prod
          push: ${{ github.event_name == 'release' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}