Creating a pull request from a fork – GitHub Docs

Warning: If your fork contains GitHub Actions workflows, the option is Allow edits and access to secrets by maintainers. Allowing edits on a fork’s branch that contains GitHub Actions workflows also allows a maintainer to edit the forked repository’s workflows, which can potentially reveal values of secrets and grant access to other branches.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork