Automatically disable nightly builds when mirrors are out of sync
Follow-up of https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/19935.
On high-severity security incidents, a security fix will be merged and deployed to production outside of the security release window. On this scenario, release managers must remember to disable the nightly builds to prevent the fix from being leaked to the public. This is a manual step that can be easily forgotten in the middle of an incident.
Similar to the merge-train detection, automation could be added to detect when mirrors are out of sync and automatically disable the nightly builds