extra/clean: add findimagedupes

extra/clean.nix

@@ -1,9 +1,12 @@
 { config, lib, pkgs, ... }:
-
+let
+  unstable = import <nixos-unstable> { config = { allowUnfree = true; }; };
+in
 {
   environment.systemPackages = with pkgs; [
     baobab
-    #dupeguru
+    dupeguru
+    unstable.findimagedupes
     jdupes
     kondo
   ];