list(...keys()) so dict_keys does not show up

llama_stack/cli/stack/build.py

@@ -218,7 +218,7 @@ def _run_stack_build_command(self, args: argparse.Namespace) -> None:
                     validator=Validator.from_callable(
                         lambda x: x in providers_for_api,
                         error_message="Invalid provider, please enter one of the following: {}".format(
-                            providers_for_api.keys()
+                            list(providers_for_api.keys())
                         ),
                     ),
                     default=(