Add timeout to automatic updates

options/auto-upgrade.nix

@@ -47,7 +47,9 @@ in
 
     config = mkIf cfg.enable {
         email.enable = true;
-        systemd.services.nixos-upgrade.script = mkOverride 50 (
+        systemd.services.nixos-upgrade = {
+            serviceConfig.TimeoutStartSec = "2h";
+            script = mkOverride 50 (
                 let
                     nixos-rebuild = "${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
                     nix-store = "${pkgs.nix}/bin/nix-store";
@@ -254,4 +256,5 @@ in
                 ''
             );
         };
+    };
 }