code: def is_container_system_config_file(file):
      
      if not file.startswith("/etc/"):
          return False
      return file in [os.path.join("/etc", f.decode()) for f in CONTAINER_ETC_FILE_OVERRIDE]
docs: Determine whether a given file is one of the files created by setup_container_system_config().
      @param file: Absolute file path as string.