forum-1.x-dev/forum.links.action.yml

forum_add_forum_local_action:
  route_name: forum.add_forum
  title: 'Add forum'
  appears_on:
    - forum.overview

forum_add_container_local_action:
  route_name: forum.add_container
  title: 'Add container'
  appears_on:
    - forum.overview