refactoring - first set the security context before persisting the entity in order to have the createdBy with username

Author: rcsoyer

src/main/java/org/acme/authorization_server/domain/service/UserService.java

@@ -37,8 +37,9 @@ public UserCreateResponse registerUser(final UserCreateRequest request) {
         checkUsernameAvailability(request.username());
         final String rawPassword = generateRandomPassword();
         final String encodedPassword = passwordEncoder.encode(rawPassword);
-        final User user = repository.save(new User(request.username(), encodedPassword));
+        final User user = new User(request.username(), encodedPassword);
         setSecurityContext(user);
+        repository.save(user);
         return new UserCreateResponse(request.username(), rawPassword);
     }