name: Dependabot auto merge
on:
  workflow_run:
    workflows: [CI]
    types:
      - completed

jobs:
  automerge:
    name: Auto merge "${{ github.event.workflow_run.head_branch }}"
    runs-on: ubuntu-22.04
    if: >
      github.event.workflow_run.event == 'pull_request'
        && github.event.workflow_run.conclusion == 'success'
        && github.actor == 'dependabot[bot]'
        && startsWith(github.event.workflow_run.head_branch, 'dependabot/')
    steps:
      - name: Checkout source
        uses: actions/checkout@v4.0.0
        with:
          ref: ${{ github.event.workflow_run.head_commit.id }}

      - name: Instruct @dependabot to merge
        run: "gh issue comment $ISSUE_ID --body \"(This is an automated comment from workflow $WORKFLOW_URL)\n\n@dependabot squash and merge\""
        env:
          GITHUB_TOKEN: ${{ secrets.DEPENDABOT_COMMENT_TOKEN }}
          ISSUE_ID: ${{ github.event.workflow_run.pull_requests[0].number  }}
          WORKFLOW_URL: ${{ github.event.repository.html_url }}/actions/runs/${{ github.run_id }}