create-update-dockerfiles-PR.yml

name: Create update dockerfiles PR

on:
  workflow_run:
    workflows: [Update external base images, Update internal base images]
    types: completed
  workflow_dispatch:

jobs:
  # ------------------------
  get_branches:
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    runs-on: ubuntu-latest
    outputs:
      branches: ${{ steps.generate-matrix.outputs.branches }}
    steps:
      - name: Check out repository code
        uses: actions/checkout@v2
      - name: Generate Matrix
        id: generate-matrix
        env:
          GITHUB_TOKEN: ${{secrets.CONTENT_BOT_TOKEN}}
        run: |
          git fetch
          branches=$(git branch -r | grep autoupdate/)
          matrix="[ "
          for branch in $(echo $branches); do
            exists=`gh pr list --state open -H ${branch#origin/}`
            if [ -z $exists ]; then
              matrix="${matrix} \"${branch#origin/}\","
            fi
          done
          matrix="${matrix%?}"
          SERVICES="${matrix} ]"
          echo ::set-output name=branches::${SERVICES}

  pull-request:
    if: ${{ needs.get_branches.outputs.branches != '[ ]' }}
    runs-on: ubuntu-latest
    needs:
      - get_branches
    strategy:
      max-parallel: 2
      fail-fast: false
      matrix:
        branches: ${{ fromJSON(needs.get_branches.outputs.branches) }}
    steps:
    - uses: actions/checkout@v2
    - name: pull-request
      id: open-pr
      uses: repo-sync/pull-request@v2
      with:
        GITHUB_TOKEN: ${{secrets.CONTENT_BOT_TOKEN}}
        source_branch: "${{ matrix.branches }}"
        destination_branch: ""                                                    # If blank, default: master
        pr_title: "build(dockerfiles) update Dockerfile - ${{ matrix.branches }}" # Title of pull request
        pr_body: "This is automated PR to update dockerfiles base images\n${{ matrix.branches }}"
    - name: approve and merge
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        PR_URL: ${{ steps.open-pr.outputs.pr_url }}
      if: ${{ steps.open-pr.outputs.pr_url }}
      run: |
        echo "Approving and merging"
        gh pr review --approve "$PR_URL"
        gh pr merge --auto --squash "$PR_URL"