forgejo: configure internal dns using /etc/hosts

hosts/crossbell/default.nix

···
           dns.override_local_dns = true;
           dns.extra_records = [
             {
-              name = "code.pvsr.dev";
-              type = "A";
-              value = hosts.ruan.config.local.tailscale.ip;
-            }
-            {
               name = "grafana.peterrice.xyz";
               type = "A";
               value = hosts.ruan.config.local.tailscale.ip;

hosts/ruan/forgejo.nix

···
   hosts = config.flake.nixosConfigurations;
 in
 {
+  flake.modules.nixos.core.networking.hosts.${hosts.ruan.config.local.tailscale.ip} = [
+    "code.pvsr.dev"
+  ];
+
   flake.modules.nixos.ruan =
     {
       config,