add audio plugin paths path

nixos-modules/audio/default.nix

@@ -17,6 +17,27 @@ in
   config = lib.mkIf cfg.enable {
     security.rtkit.enable = true;
 
+    environment.sessionVariables =
+      let
+        makePluginPath =
+        format:
+          "$HOME/.${format}:" +
+          (lib.makeSearchPath format [
+            "$HOME/.nix-profile/lib"
+            "/run/current-system/sw/lib"
+            "/etc/profiles/per-user/$USER/lib"
+            ]);
+      in
+      {
+        CLAP_PATH = lib.mkDefault (makePluginPath "clap");
+        DSSI_PATH = lib.mkDefault (makePluginPath "dssi");
+        LADSPA_PATH = lib.mkDefault (makePluginPath "ladspa");
+        LV2_PATH = lib.mkDefault (makePluginPath "lv2");
+        LXVST_PATH = lib.mkDefault (makePluginPath "lxvst");
+        VST3_PATH = lib.mkDefault (makePluginPath "vst3");
+        VST_PATH = lib.mkDefault (makePluginPath "vst");
+      };
+
     services.pipewire = {
       enable = true;
       systemWide = false;