Add an example to setup a custom NTP (Chrony) configuration

[travier]

Write an example FCCT config to setup a custom NTP server for Chrony.

Chrony documentation: https://chrony.tuxfamily.org/documentation.html

[travier]

Example:

storage:
  files:
    - path: /etc/chrony.conf
      overwrite: yes
      mode: 0644
      contents:
        inline: |
          ...

[lucab]

There is an ongoing thread right now on Fedora devel ML about splitting chrony config into fragments: https://lists.fedoraproject.org/archives/list/[email protected]/thread/CEONIMCGXH4CXQJZTDK4NDRDJ7FXDIYI/.

It may be worth waiting a bit more before documenting this, and directly use config fragments as soon as available.