docker_build.yml

# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help

name: Create and publish a Docker image

on:
  push:
    branches:
      - 'main'
    tags:
      - '*'
  pull_request:
    branches:
      - 'main'

env:
  REGISTRY: ghcr.io
  IMAGE_PATH: ghcr.io/${{ github.repository }}

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

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
          
      - name: Log in to the Container registry
        uses: docker/login-action@v2.1.0
        if: github.event_name != 'pull_request'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v4.1.1
        with:
          images: ${{ env.IMAGE_PATH }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v3.2.0
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}