features:
  - |
    Add `undercloud_roles_data` for containerized undercloud
    deployments. Allows to specify a custom undercloud roles file which
    should be taken into account when preparing docker images for UC.
    Defaults to `{{overcloud_templates_path}}/roles_data_undercloud.yaml`.

    .. note :: The default value can not be changed yet. The command
      `openstack undercloud deploy` works only with the static role file
      `roles_data_undercloud.yaml` from t-h-t. Custom undercloud roles
      data files, like `roles/UndercloudLight.yaml`, need to be copied as
      `{{ overcloud_heat_templates }}/roles_data_undercloud.yaml` in order
      to use this feature.