---
name: Docker

on:
  push:
    # Publish `master` as Docker `latest` image.
    branches:
      - master

    # Publish `v1.2.3` tags as releases.
    tags:
      - v*

  # Run tests for any PRs.
  pull_request:
    branches:
      - master

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

jobs:
  # Build Docker image
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3

      - name: Build Docker image
        run: docker build . --file Dockerfile

  # Publish built Docker image to the configured registry
  push:
    needs: build
    if: ${{ github.event_name != 'pull_request' }}
    permissions:
      contents: read
      packages: write

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3

      - name: Log into GitHub Container Registry
        uses: docker/login-action@49ed152c8eca782a232dede0303416e8f356c37b
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@69f6fc9d46f2f8bf0d5491e4aabe0bb8c6a4678a
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push Docker image
        uses: docker/build-push-action@e551b19e49efd4e98792db7592c17c09b89db8d8
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}