feat: Derive strum::AsRefStr for ClientAuthenticationMethod

Author: sbernauer

crates/stackable-operator/CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- Derive `strum::AsRefStr` for `ClientAuthenticationMethod` ([#XXXX]).
+
+[#XXXX]: https://github.com/stackabletech/operator-rs/pull/XXXX
+
 ## [0.110.0] - 2026-04-10
 
 ### Added

crates/stackable-operator/src/crd/authentication/oidc/mod.rs

@@ -109,8 +109,10 @@ pub mod versioned {
         PartialEq,
         PartialOrd,
         Serialize,
+        strum::AsRefStr,
     )]
     #[serde(rename_all = "snake_case")]
+    #[strum(serialize_all = "snake_case")]
     pub enum ClientAuthenticationMethod {
         /// Authenticate using HTTP Basic authentication with client_id and client_secret.
         /// This is the default method according to the OIDC spec.