lib/config: enable site.net.pub.dynamicDomain

nix/lib/config/legacy.nix

@@ -45,7 +45,10 @@ in
       };
       domainName = dhcpData.string-opts.domain-name;
     }) pillar.dhcp)
-    { core.ospf.secret = pillar.ospf.secret; }
+    {
+      core.ospf.secret = pillar.ospf.secret;
+      pub.dynamicDomain = true;
+    }
 
     # net priv* settings
     (