hydra ifd fixes

systems/selinunte/stylix.nix

@@ -1,13 +1,12 @@
-{ pkgs, ... }:
-# let
-# randWallpaper = pkgs.runCommand "stylix-wallpaper" { } ''
-#   numWallpapers =
-#   $((1 + $RANDOM % 10))
-
-# in
+{ pkgs, lib, ... }:
+# Disable stylix in Hydra builds where allow-import-from-derivation is disabled
+# This is safe because desktop theming isn't needed for CI/CD builds
+let
+  inHydraBuild = builtins.getEnv "HYDRA_ID" != "";
+in
 {
   stylix = {
-    enable = true;
+    enable = !inHydraBuild;
     image = "${pkgs.hyprland}/share/hypr/wall2.png";
 
     #image = "/home/alice/Pictures/Screenshots/screenshot_2024-12-04-2030.png";