chore(ubi-rust-builders): Remove ubi8-rust-builder

Author: NickLarsenNZ

CHANGELOG.md

@@ -56,6 +56,7 @@ All notable changes to this project will be documented in this file.
 
 - ci: Remove Nexus steps from build, mirror and release workflows ([#1056]).
   Also remove the old release workflow.
+- ubi8-rust-builder (#[xxx]).
 
 [#1025]: https://github.com/stackabletech/docker-images/pull/1025
 [#1027]: https://github.com/stackabletech/docker-images/pull/1027
@@ -75,6 +76,7 @@ All notable changes to this project will be documented in this file.
 [#1054]: https://github.com/stackabletech/docker-images/pull/1054
 [#1055]: https://github.com/stackabletech/docker-images/pull/1055
 [#1056]: https://github.com/stackabletech/docker-images/pull/1056
+[#xxx]: https://github.com/stackabletech/docker-images/pull/xxx
 
 ## [25.3.0] - 2025-03-21