build-publish-devcontainer.yml

# From the following references:
#  - https://dev.to/github/publishing-a-docker-image-to-githubs-container-repository-4n50
#  - https://docs.github.com/en/actions/publishing-packages/publishing-docker-images

name: Create and publish Docker devcontainer
on:
  push:
    branches: ['main', 'neighborhood/speed-up-devcontainer-startup'] # second branch is temporary for testing...
    paths:
      - .github/workflows/build-publish-devcontainer.yml
      - .devcontainer/Dockerfile
      - .ruby-version
      - Gemfile
      - Gemfile.lock
      - yarn.lock

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

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

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

      - name: Log in to the Container registry
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository }}-devcontainer
          tags: |
            type=sha
            type=raw,value=latest


      - name: Build and push Docker image
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          context: .
          file: .devcontainer/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}