Configure ddclient with duckdns as a provider

modules/networking.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+let password = builtins.readFile /var/keys/ddclient;
+
+in {
   # Assign a static IP
   networking = {
     hostName = "unit";
@@ -31,6 +33,15 @@
     };
   };
 
+  # Dynamic DNS configuration
+  services.ddclient = {
+    enable = true;
+    quiet = true;
+    protocol = "duckdns";
+    domains = [ "coace.duckdns.org" ];
+    inherit password;
+  };
+
   # Firewall configuration
   networking.firewall = {
     allowedTCPPorts = [