Add basic theme config

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/scripts/cleanup/cleanup.sh

@@ -1,5 +1,3 @@
-set -e
-
 if [ "$(id -u)" -ne 0 ]; then
   echo "This script must be run as root or with sudo privileges."
   exit 1

hosts/common/scripts/cleanup/default.nix

@@ -1,5 +1,16 @@
 { pkgs, ... }:
 
 {
-  environment.systemPackages = [ (pkgs.writeShellScriptBin "nix-cleanup" (builtins.readFile ./cleanup.sh)) ];
+  environment.systemPackages = [
+    (pkgs.writeShellApplication {
+      name = "nix-cleanup";
+      runtimeInputs = with pkgs; [
+        coreutils-full
+        btrfs-progs
+        util-linux
+        nix
+      ];
+      text = builtins.readFile ./cleanup.sh;
+    })
+  ];
 }