Move "disallow merging to maintained branches" closer to tagging
Updating GitLab settings for all maintained branches to disallow merging to them has an unfortunate consequence: daily scheduled pipelines won't be executed anymore. This is a problem because we need the pipelines to ensure no new bugs were introduced just before a code freeze.
The "Announce (on Mattermost) that the code freeze is in effect" item is still in place but is now more of a social "disallow merging to maintained branches".
Trigered by MM discussion.
Edited by Michal Nowak