Add automatic system upgrades

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

common/default.nix

@@ -1,4 +1,4 @@
-{ lib, pkgs, ... }:
+{ inputs, lib, pkgs, ... }:
 
 {
   imports = [
@@ -58,7 +58,7 @@
   programs = {
     nix-ld = {
       enable = true;
-      libraries = with pkgs; [ ];
+      libraries = [ ];
     };
   };
 
@@ -67,5 +67,19 @@
   '';
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
-  system.stateVersion = "24.05";
+
+  system = {
+    autoUpgrade = {
+      enable = true;
+      flake = inputs.self.outPath;
+      flags = [
+        "--update-input"
+        "nixpkgs"
+        "-L"
+      ];
+      dates = "02:00";
+    };
+
+    stateVersion = "24.05";
+  };
 }