I don't know a way to enforce this, but what may help is knowing that by default, you can push into the PR branch even if it is from someone else's fork: https:

I don't know a way to enforce this, but what may help is knowing that by default, you can push into the PR branch even if it is from someone else's fork: https://docs.github.com/en/free-pro-team@latest/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork https://docs.github.com/en/free-pro-team@latest/github/colla...