ansible-roles/ssh-keys/tasks/root-ssh-keys.yml

---
- name: Install the ssh keys for the authorized users
  authorized_key: user=root key="{{ item }}" state=present
  with_items: '{{ user_ssh_key }}'
  tags: [ 'pubkeys', 'ssh_keys' ]

- name: Remove obsolete ssh keys if there are any
  authorized_key: user=root key="{{ item }}" state=absent
  with_items: '{{ obsolete_ssh_key }}'
  when: obsolete_ssh_key is defined
  tags: [ 'pubkeys', 'ssh_keys' ]