port to flakes

nixos/modules/update.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let
+  cfg = config.dadada.autoUpgrade;
+in
+{
+
+  options.dadada.autoUpgrade = {
+    enable = mkEnableOption "Enable automatic upgrades";
+  };
+
+  config = mkIf cfg.enable {
+    nix = {
+      autoOptimiseStore = false;
+      useSandbox = true;
+      gc = {
+        automatic = true;
+        dates = "weekly";
+        options = "--delete-older-than 7d";
+      };
+    };
+
+    system.autoUpgrade = {
+      enable = true;
+      dates = "daily";
+    };
+  };
+}