- hosts: localhost
  gather_facts: false
  tasks:
    - name: Add localhost to all group if no hosts are defined
      ansible.builtin.add_host:
        name: "localhost"
        ansible_connection: "local"
      when: groups['all'] | length == 0


- hosts: all
  become: true
  tasks:
    - ansible.builtin.import_role:
        name: "host"