use authServerUrl when defined (#29746)

fixes: #29641

Signed-off-by: Erik Jan de Wit <erikjan.dewit@gmail.com>

js/libs/ui-shared/src/context/KeycloakContext.tsx

@@ -49,7 +49,10 @@ export const KeycloakProvider = <T extends BaseEnvironment>({
   const [error, setError] = useState<unknown>();
   const keycloak = useMemo(() => {
     const keycloak = new Keycloak({
-      url: environment.authUrl,
+      url:
+        "authServerUrl" in environment
+          ? (environment.authServerUrl as string)
+          : environment.authUrl,
       realm: environment.realm,
       clientId: environment.clientId,
     });