github-action-trigger-downstream-job-reusable-workflow.yaml

name: Github Action reusable workflow to trigger downstream job

on:
  workflow_call

jobs:
  jobs01:
    # Check if comment contains /trigger github-experimental
    if: contains(github.event.comment.body, '/trigger github-experimental')
    runs-on: [ubuntu-latest]
    permissions:
      pull-requests: write
    outputs:
      approvers_check: ${{ steps.approvers_check.outputs.approvers_check }}
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            OWNERS
          sparse-checkout-cone-mode: false
          ref: main

      - name: Get approvers list
        id: approvers_list
        uses: mikefarah/yq@master
        with:
          cmd: yq -o=csv ".approvers" OWNERS

      - name: Print Approvers list
        run: echo ${{ steps.approvers_list.outputs.result }}

      - name: Check commenter status
        id: approvers_check
        run: |
          APPROVERS_CHECK=$(python -c "print('${{ github.event.comment.user.login }}' in '${{ steps.approvers_list.outputs.result }}')")
          echo "approvers_check=$APPROVERS_CHECK" >> "$GITHUB_OUTPUT"

      - name: Add proper labels to trigger workflow
        if: steps.approvers_check.outputs.approvers_check == 'True'
        uses: actions-ecosystem/action-add-labels@v1
        with:
          labels: |
            github-experimental

      - name: Print message for non approvers
        if: steps.approvers_check.outputs.approvers_check == 'False'
        uses: mshick/add-pr-comment@v2
        with:
          refresh-message-position: true
          message: |
            @${{ github.actor }}, You are not listed in project's approvers list. Please check with repo approvers to trigger the downstream job