submit-backport crashes if external reviewers are requested #21548
Description
The submit-backport script fails with the following error if one attempts to submit a backport PR with external contributors:
ontrib/backporting/submit-backport 1.12 v1.12-backport-2022-08-29.txt origin
....
Sending pull request...
remote:
remote: Create a pull request for 'pr/v1.12-backport-2022-08-29' on GitHub by visiting:
remote: https://github.com/glibsm/cilium/pull/new/pr/v1.12-backport-2022-08-29
remote:
Error requesting reviewer: Unprocessable Entity (HTTP 422)
Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the cilium/cilium repository.
Signal ERR caught!
Traceback (line function script):
49 main contrib/backporting/submit-backport
Ideally, the script should not fail and instead avoid adding external contributors as reviewers. This is currently unfortunately enforced by the GitHub API, maybe we can try to add reviewers one by one.
cc @bimmlerd