validate-pull-request-source.yml

name: validate-pull-request-source
on: pull_request

jobs:
  validate-pull-request-source:
    runs-on: ubuntu-latest
    steps:
      - name: Validate if PR is not from a forked repo
        run: |
          if [ "${{ github.event.pull_request.head.repo.full_name }}" != "${{ github.repository }}" ]; then
            echo "Please create the PR from a branch in this repository, not from a forked repository."
            exit 1
          else
            echo "PR is from a branch in this repository."
          fi