add changelog

Author: xeniape

crates/stackable-operator/CHANGELOG.md

@@ -8,7 +8,12 @@ All notable changes to this project will be documented in this file.
 
 - `iter::reverse_if` helper ([#838]).
 
+### Changed
+
+- BREAKING: Swap priority order of role group config and role overrides in configuration merging to prioritize overrides in general ([#841]).
+
 [#838]: https://github.com/stackabletech/operator-rs/pull/838
+[#841]: https://github.com/stackabletech/operator-rs/pull/841
 
 ## [0.73.0] - 2024-08-09