cas_server.links.action.yml

entity.cas_server_service.add_form:
  route_name: 'entity.cas_server_service.add_form'
  title: 'Add Service definition'
  appears_on:
    - entity.cas_server_service.collection

entity.cas_server_service.collection:
  route_name: 'entity.cas_server_service.collection'
  title: 'Add/Edit Service definitions'
  appears_on:
    - cas_server.settings