<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def make_directory_writable(dirname):
 """Makes directory readable and writable by everybody. Args: dirname: name of the directory Returns: True if operation was successfull If you run something inside Docker container and it writes files, then these files will be written as root user with restricted permissions. So to be able to read/modify these files outside of Docker you have to change permissions to be world readable and writable. """

  retval = shell_call(['docker', 'run', '-v',
                       '{0}:/output_dir'.format(dirname),
                       'busybox:1.27.2',
                       'chmod', '-R', 'a+rwx', '/output_dir'])
  if not retval:
    logging.error('Failed to change permissions on directory: %s', dirname)
  return retval