code: def validate_backup(configuration, backup_data):
      
      extract_archive(backup_data['archive_path'],
                      backup_data['workdir'])
      docker_client = Client(configuration['docker']['url'])
      container = run_container(docker_client, backup_data)
      return_code = docker_client.wait(container)
      print('Container return code: {}'.format(return_code))
      if return_code != 0:
          notifier = MailNotifier(configuration['mail'])
          report = {'archive': backup_data['archive_path'],
                    'image': backup_data['image'],
                    'container_id': container.get('Id')}
          notifier.send_report(report)
      else:
          docker_client.remove_container(container)
      remove_file(backup_data['workdir'])
docs: Celery task.
      It will extract the backup archive into a unique folder
      in the temporary directory specified in the configuration.
  
      Once extracted, a Docker container will be started and will
      start a restoration procedure. The worker will wait for the
      container to exit and retrieve its return code.
      A notification is sent if the return code is != 0.
      If the return code == 0, the container will be removed.
  
      Lastly, it will remove the temporary workdir.