contacts_events-8.x-1.x-dev/modules/accommodation/contacts_events_accommodation.links.action.yml

c_events_accommodation.type_add:
  route_name: entity.c_events_accommodation_type.add_form
  title: 'Add accommodation type'
  appears_on:
    - entity.c_events_accommodation_type.collection

c_events_accommodation.add_page:
  route_name: entity.c_events_accommodation.add_form
  deriver: \Drupal\contacts_events_accommodation\Plugin\Derivative\AccommodationActionDeriver
  appears_on:
    - entity.c_events_accommodation.collection