Sync stable branches to CE upon a push
What does this MR do?
This adds a CI job that runs before all other jobs on a stable branch, triggering a Merge Train job to sync the stable branch to CE. No checks are in place for older stable branches, as those simply won't have these changes.
This fixes gitlab-com/gl-infra/delivery#468 (closed)
TODO
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Test on a dummy stable branch
Edited by Yorick Peterse