Gitlab EE omnibus: No 'Europe/Kyiv' time zone available in pipeline editor dropdown after upgrade to v18.4.0-ee

Summary

Hi,

After upgrade to v18.4.0-ee there was issue with scheduled pipilines During investigation there was found lack of timezone 'Europe/Kyiv' that was previously available. All pipelines configured with this time zone was stucked.

Please fix

Findings

This is not due to any GitLab code, but a dependency on the environment's content from the tzdata package. Some timezone data has changed upstream, and users may need to supplementally install tzdata-legacy (Ubuntu & Debian).

More details can be found in the release notes from the original project, and any changes to distributed content is outside the control of GitLab, as we rely upon the common, external content from the system on which GitLab operates. See also #571698 (comment 2775764636)