[oniro] MR rebase fails occasionally

Summary

Sometimes, rebasing an MR results in UI failing with the following reported error:

Merge failed: Rebase failed. Please rebase locally. Please try again.

Immediately retrying the rebase (through the same UI button) works but the UI gets stuck into Checking if merge request can be merged… loading state. A page refresh shows that it actually succeeded and the new pipelines were triggered.

Steps to reproduce

I am not aware of a way to reproduce it. The last time it happened to me was on this (eclipse/oniro-core/oniro!214 (merged)) MR @ 2022-07-21 ~13:25 UTC+01:00.

What is the current bug behavior?

Rebase functionality seems unstable - even when there are no conflicts.

What is the expected correct behavior?

Rebase should work when no conflicts are generated.

Relevant logs and/or screenshots

See above.