Ansible: test for user existence

testfile.yml

  - name: get list of existing users
    ansible.builtin.getent:
      database: passwd

  - name: get list of existing usernames
    ansible.builtin.set_fact:
      existing_users: "{{ ansible_facts.getent_passwd.keys() | list }}"
      
  - name: create ansible user
    ansible.builtin.user:
      name: xyz
      state: present      
      shell: /bin/bash
      append: yes
    when: "'xyz' not in existing_users"