update-pangeo-dockerfile.yml

name: Update Dockerfile from Source
# For this to work, you must all actions to create PRs at the org level

on:
  push:
    branches:
      - main
      - dev
    paths:
      - '.github/workflows/update-pangeo-dockerfile.yml' 
  workflow_dispatch:  # Manual trigger
  schedule:
    - cron: '0 3 * * *'  # Runs daily at 3:00 AM UTC

jobs:
  update-dockerfile:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v3
        with:
          ref: ${{ github.ref }}  # Base branch (main or dev)

      - name: Fetch Raw Dockerfile
        id: fetch_dockerfile
        run: |
          URL="https://raw.githubusercontent.com/pangeo-data/pangeo-docker-images/master/base-image/Dockerfile"
          curl -o base-image/Dockerfile.temp $URL
          # Strip everything after ENTRYPOINT and save it to a new file
          awk '/ENTRYPOINT/ {print; exit} {print}' base-image/Dockerfile.temp > base-image/Dockerfile.new
          rm base-image/Dockerfile.temp

          # Compare the downloaded version with the existing Dockerfile
          if cmp -s base-image/Dockerfile base-image/Dockerfile.new; then
            echo "No changes in Dockerfile."
            echo "changed=false" >> $GITHUB_ENV
            rm base-image/Dockerfile.new
          else
            echo "Dockerfile has changed."
            mv base-image/Dockerfile.new base-image/Dockerfile
            echo "changed=true" >> $GITHUB_ENV
          fi
    
      - name: Create Pull Request
        if: env.changed == 'true'
        uses: peter-evans/create-pull-request@v7
        with:
          commit-message: Update base-image Dockerfile
          committer: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
          branch: update-dockerfile
          delete-branch: true
          title: 'Update Dockerfile'
          body: |
            Update Pangeo base-image Dockerfile
            - Auto-generated by [create-pull-request][1]
            [1]: https://github.com/peter-evans/create-pull-request
          assignees: eeholmes
          reviewers: eeholmes
          draft: false