Ansible: Add keys to known host with ssh-keyscan

fill-known-hosts.md

- name: Update ~/.ssh/known_hosts file
  hosts: all
  gather_facts: false
  become: false
  tasks:
    - name: Update ~/.ssh/known_hosts
      ansible.builtin.known_hosts:
        name: "{{ inventory_hostname }}"
        key: "{{ lookup('pipe', 'ssh-keyscan ' + inventory_hostname) }}"
      delegate_to: localhost