code: def make_config(self, instance_relative: bool = False) -> Config:
          
          config = self.config_class(
              self.instance_path if instance_relative else self.root_path,
              DEFAULT_CONFIG,
          )
          config['ENV'] = get_env()
          config['DEBUG'] = get_debug_flag()
          return config
docs: Create and return the configuration with appropriate defaults.