Revert "Disable nix autoUpgrade for regular machines"

This reverts commit ce7c6ec582.

hosts/Legion/configuration.nix

@@ -1,7 +1,7 @@
 # Edit this configuration file to define what should be installed on
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running `nixos-help`).
-{ ... }:
+{ lib, ... }:
 let
   # generate via openvpn --genkey --secret openvpn-laptop.key
   client-key = "/root/openvpn.key";
@@ -11,10 +11,7 @@ let
 in {
   users.mutableUsers = false;
   system.autoUpgrade = {
-    enable = true;
-    flake = "git+https://git.xenia.me.uk/xenia/nixos.git?ref=main";
-    dates = "02:30";
-    allowReboot = true;
+    allowReboot = lib.mkForce true;
     rebootWindow = {
       lower = "02:00";
       upper = "05:00";

system/default.nix

@@ -1,4 +1,6 @@
-{ pkgs, ... }: {
+{ config, lib, pkgs, ... }:
+let flakeURL = "git+https://git.xenia.me.uk/xenia/nixos.git?ref=main";
+in {
   networking = {
     networkmanager.enable = true;
     nameservers = [ "9.9.9.9" ];
@@ -38,4 +40,10 @@
       LC_TIME = locale;
     };
   };
+  system.autoUpgrade = {
+    enable = true;
+    dates = "02:00";
+    allowReboot = false;
+    flake = flakeURL;
+  };
 }