feat: Builder config settable with options

sw/builders/programs.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  pkgs,
+  inputs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.ugaif.sw;
+  basePackages = with pkgs; [
+    # Build-related packages can be added here if needed
+  ];
+in
+{
+  environment.systemPackages = subtractLists cfg.excludePackages (basePackages ++ cfg.extraPackages);
+}