def METHOD_NAME(self, job_id: str, app_name: str, app_staging_path: str) -> str:
    """Deploy the specified app to the server.
    Copy the app folder tree from staging area to the server's RUN area
    Args:
        job_id: job id of the app to be deployed
        app_name: name of the app to be deployed
        app_staging_path: the full path to the app folder in staging area
    Returns:
        An error message. An empty string if successful.
    """
    pass