orchis-theme: add withWallpapers option

pkgs/data/themes/orchis-theme/default.nix

@@ -6,6 +6,7 @@
 , gtk-engine-murrine
 , sassc
 , tweaks ? [ ] # can be "solid" "compact" "black" "primary"
+, withWallpapers ? false
 }:
 
 let
@@ -42,6 +43,10 @@ rec {
   installPhase = ''
     runHook preInstall
     bash install.sh -d $out/share/themes -t all ${lib.optionalString (tweaks != []) "--tweaks " + builtins.toString tweaks}
+    ${lib.optionalString withWallpapers ''
+      mkdir -p $out/share/backgrounds
+      cp src/wallpaper/{1080p,2k,4k}.jpg $out/share/backgrounds
+    ''}
     runHook postInstall
   '';