docs: def default_bundle_config():
      """Return the default bundle config file as an AttrDict."""
  
      import os
      from ambry.util import AttrDict
  
      config = AttrDict()
      f = os.path.join(
          os.path.dirname(
              os.path.realpath(__file__)),
          'bundle.yaml')
  
      config.update_yaml(f)
  
      return config