Based on:
- https://www.reddit.com/r/Ubiquiti/comments/i9ft5u/so_heres_how_i_got_local_dns_records_working_on/
- https://github.com/unifi-utilities/unifios-utilities/blob/main/on-boot-script/examples/udm-files/on_boot.d/15-add-root-ssh-keys.sh
- https://github.com/unifi-utilities/unifios-utilities/blob/main/on-boot-script