docs: def download_workflow_description_file(self, filename):
          '''Downloads the workflow description and writes it to a *YAML* file.
  
          Parameters
          ----------
          filename: str
              path to the file to which description should be written
  
          See also
          --------
          :meth:`tmclient.api.TmClient.download_workflow_description`
          '''
          description = self.download_workflow_description()
          logger.info('write workflow description to file: %s', filename)
          with open(filename, 'w') as f:
              content = yaml.safe_dump(
                  description, default_flow_style=False, explicit_start=True
              )
              f.write(content)