The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The third breaking change window begins 2024-05-06 09:00 UTC and ends 2024-05-08 22:00 UTC.
Fix for #2090 (closed)
I couldn't find a good way to make env vars take precedence over ui.cfg without reworking the whole config setup. ui.cfg currently takes precedence so it would be a breaking change anyway.