ansible/roles/shell/tasks/users/vnc.yml

---
- name: add group vnc
  group:
    name: vnc
    system: yes
    state: present

- name: Add the user vnc
  user:
    name: vnc
    system: yes
    shell: /bin/false
    groups: vnc
    create_home: yes
    home: /var/lib/vnc
    state: present