backport: serialize concurrent backports
Prevents the backport patches(s) from being merged if there is already another backport in process
Bug: T345247
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
Prevents the backport patches(s) from being merged if there is already another backport in process
Bug: T345247