Updating noip-duc hostnames

notes.txt

# Using v3 (Rust rewrite)
noip-duc --version

# As ours if running as a service,
# edit /etc/default/noip-duc (the systemd unit reads its config from there)
# and change NOIP_HOSTNAMES, then:
sudo systemctl restart noip-duc
sudo systemctl status noip-duc

# One shortcut worth knowing: if you're using DDNS Keys,
# you set the hostname to all.ddnskey.com and it updates everything the key covers
# — no need to list individual hostnames. That means new hostnames get picked up
# without touching the config at all, as long as they're in the key's scope.