code: def promote_artifacts(self, promote_stage='latest'):
          
          if promote_stage.lower() == 'alpha':
              self._sync_to_uri(self.s3_canary_uri)
          elif promote_stage.lower() == 'canary':
              self._sync_to_uri(self.s3_latest_uri)
          else:
              self._sync_to_uri(self.s3_latest_uri)
docs: Promote artifact version to dest.
  
          Args:
              promote_stage (string): Stage that is being promoted