Check if serials are in sync
It would be nice if it could check if the serials are in sync.
E.g. for my zone it says "OK", but the serials are not in sync:
check-soa schafweide.org
ns.schafweide.org.
2a01:4f8:c010:24b0::1: OK: 2023012602
159.69.251.40: OK: 2023012602
robotns2.second-ns.de.
2a01:4f8:d0a:2004::2: OK: 2023012601
213.133.105.6: OK: 2023012601
robotns3.second-ns.com.
193.47.99.3: OK: 2023012601
2001:67c:192c::add:a3: OK: 2023012601