Add git to systemPackages

modules/system.nix

@@ -24,6 +24,10 @@
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;
 
+  environment.systemPackages = with pkgs; [
+    git
+  ];
+
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.panotaka = {
     isNormalUser = true;