code: def assert_consistent_regions(from_spec, from_command_line, builder_exception):
      
      if from_spec is None or from_command_line is None:
          return
      if set(from_spec) != set(from_command_line):
          raise builder_exception("--region and the 'regionalOptions' key in the JSON file do not agree")
docs: Verifies the regions passed with --region CLI argument and the ones
      specified in regionalOptions are the same (if both CLI and spec were used)