code: def validate_task_schema(context, schema_key='schema_file'):
      
      schema_path = context.config
      schema_keys = schema_key.split('.')
      for key in schema_keys:
          schema_path = schema_path[key]
  
      task_schema = load_json_or_yaml(schema_path, is_path=True)
      log.debug('Task is validated against this schema: {}'.format(task_schema))
  
      try:
          validate_json_schema(context.task, task_schema)
      except ScriptWorkerTaskException as e:
          raise TaskVerificationError('Cannot validate task against schema. Task: {}.'.format(context.task)) from e
docs: Validate the task definition.
  
      Args:
          context (scriptworker.context.Context): the scriptworker context. It must contain a task and
              the config pointing to the schema file
          schema_key: the key in `context.config` where the path to the schema file is. Key can contain
              dots (e.g.: 'schema_files.file_a'), in which case
  
      Raises:
          TaskVerificationError: if the task doesn't match the schema