enable auto update

configuration.nix

@@ -100,7 +100,10 @@
   ];
 
   # Enable the OpenSSH daemon.
-  services.openssh.enable = true;
+  services.openssh = {
+    ports = [2220];
+    openFirewall = true;
+  };
 
   # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];
@@ -115,5 +118,6 @@
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "25.11"; # Did you read the comment?
+  system.autoUpgrade.enable = true;
 
 }