Backport bot
Copy from infra#10714
Would be great to have a bot (similar to this) to create backport MRs from GitLab comments.
The bot should create a new branch based on the requested stable branch, chery-pick the commits from the MR and create a MR if the commits apply. Maybe it could also have some heuristic to solve trivial conflicts, like pkgrel
bump or fetching intermediate commits.