tripleo-common/roles/tripleo-create-admin/tasks/authorize_user.yml

- name: authorize TripleO Mistral key for user {{ tripleo_admin_user }}
  lineinfile:
    path: /home/{{ tripleo_admin_user }}/.ssh/authorized_keys
    line: '{{ tripleo_admin_pubkey }}'
    regexp: 'Generated by TripleO'