parts/pkgs: init custom packages

modules/shell/module.nix

@@ -0,0 +1,22 @@
+{
+  config,
+  inputs,
+  lib,
+  pkgs,
+  ...
+}: let
+  test = inputs.wrapper-manager.lib.build {
+    inherit pkgs;
+    modules = [
+      {
+        wrappers = {
+          test = {
+            basePackage = pkgs.hello;
+          };
+        };
+      }
+    ];
+  };
+in {
+  environment.systemPackages = [test];
+}