Completed the part with caddy. Problems with exporterr and api keys

modules/networking/tailscale.nix

@@ -1,7 +1,8 @@
-{ lib
-, config
-, pkgs
-, ...
+{
+  lib,
+  config,
+  pkgs,
+  ...
 }:
 with lib;
 let
@@ -26,6 +27,15 @@ in
       '';
     };
 
+    magicDNSDomain = mkOption {
+      type = types.str;
+      default = "";
+      example = "example.ts.net";
+      description = ''
+        This unique name is used when registering DNS entries, sharing your device to other tailnets, and issuing TLS certificates
+      '';
+    };
+
     exitNode = mkOption {
       type = types.str;
       default = "";
@@ -53,6 +63,12 @@ in
       useRoutingFeatures = if cfg.exitNode == "" then "none" else "both";
       extraUpFlags = [ "--exit-node=${cfg.exitNode}" ] ++ cfg.extraUpFlags;
     };
+
+    networking = {
+      nameservers = [ "100.100.100.100" ];
+      search = [ cfg.magicDNSDomain ];
+    };
+
   };
 
 }