That line isn’t actually adding an users to sudoers, merely making sure that the wheel group can have passwordless sudo for all command.
As for adding users to /etc/sudoers this is best done by adding users to necessary groups and then giving these groups the relevant access to sudo. This holds true when you aren’t using Ansible too.
The user module allows you to specify an exclusive list of group or to simply append the specified groups to the current ones that the user already has. This is naturally idempotent as a user cannot be defined to be in a group multiple times.
An example play might look something like this:
- hosts: all
vars:
sudoers:
- user1
- user2
- user3
tasks:
- name: Make sure we have a 'wheel' group
group:
name: wheel
state: present
- name: Allow 'wheel' group to have passwordless sudo
lineinfile:
dest: /etc/sudoers
state: present
regexp: '^%wheel'
line: '%wheel ALL=(ALL) NOPASSWD: ALL'
validate: visudo -cf %s
- name: Add sudoers users to wheel group
user:
name: "{{ item }}"
groups: wheel
append: yes
with_items: "{{ sudoers }}"