use UI_MIRRORED_BRANCH everywhere
I updated the UI_MIRRORED_BRANCH variable from master to main already, so that should be all that is needed!
GitLab will be down for maintenance Monday June 03, from approx 10am UTC for roughly 48 hours. This is for a major gitlab upgrade which requires a DB migration. See the tracker issue for more informations.
I updated the UI_MIRRORED_BRANCH variable from master to main already, so that should be all that is needed!