ansible/roles/common/tasks/hostname.yml

---
- name: Set a hostname
  ansible.builtin.hostname:
    name: "{{ host.hostname }}"
  become: true

- name: Update /etc/hosts to reflect the new hostname
  ansible.builtin.lineinfile:
    path: /etc/hosts
    regexp: '^127\.0\.1\.1'
    line: "127.0.1.1 {{ host.hostname }}"
    state: present
    backup: true
  become: true