docker-publish-523-autograder-r.yml

# Publishes docker image, pinning actions to a commit SHA,
# and updating most recently built image with the latest tag.
# Can be triggered by either pushing a commit that changes the `Dockerfile`, 
# or manually dispatching the workflow.

name: Publish Docker image (523 R Autograder)

on: 
  workflow_dispatch:
  push: 
    paths: 
      - '523/autograder-r/Dockerfile'
      
jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repo
        uses: actions/checkout@v4
      
      - name: Log in to Docker Hub
        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
        with:
          images: ubcmds/523-autograder-r
          tags: |
            type=raw, value={{sha}},enable=${{github.ref_type != 'tag' }}
            type=raw, value=latest
      
      - name: Build and push Docker image
        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671
        with:
          context: ./523/autograder-r
          file: 523/autograder-r/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}