pm-4.1.x-dev/modules/pm_project/pm_project.links.action.yml

pm_project.type_add:
  title: 'Add Project type'
  route_name: entity.pm_project_type.add_form
  appears_on:
    - entity.pm_project_type.collection

pm_project.add_page:
  title: 'Add Project'
  route_name: entity.pm_project.add_page
  appears_on:
    - entity.pm_project.collection
    - view.pm_project.collection