audio: enable security.rtkit for pipewire

This should avoid stuttering audio when CPU is busy

modules/audio/default.nix

@@ -1,11 +1,14 @@
-{ lib, config, pkgs, ... }:
-with lib;
-let
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+with lib; let
   psCfg = config.pub-solar;
   cfg = config.pub-solar.audio;
   xdg = config.home-manager.users."${psCfg.user.name}".xdg;
-in
-{
+in {
   options.pub-solar.audio = {
     enable = mkEnableOption "Life in highs and lows";
     mopidy.enable = mkEnableOption "Life with mopidy";
@@ -24,8 +27,10 @@ in
       extraGroups = ["audio"];
     };
 
-    home-manager = with pkgs; pkgs.lib.setAttrByPath [ "users" psCfg.user.name ] {
-      home.packages = [
+    home-manager = with pkgs;
+      pkgs.lib.setAttrByPath ["users" psCfg.user.name] {
+        home.packages =
+          [
             # easyeffects, e.g. for microphone noise filtering
             easyeffects
             mu
@@ -35,7 +40,12 @@ in
             # Needed for pactl cmd, until pw-cli is more mature (vol up/down hotkeys?)
             pulseaudio
             vimpc
-      ] ++ (if cfg.spotify.enable then [ pkgs.spotify-tui ] else [ ]);
+          ]
+          ++ (
+            if cfg.spotify.enable
+            then [pkgs.spotify-tui]
+            else []
+          );
         xdg.configFile."vimpc/vimpcrc".source = ./.config/vimpc/vimpcrc;
         systemd.user.services.easyeffects = import ./easyeffects.service.nix pkgs;
 
@@ -54,6 +64,8 @@ in
         };
       };
 
+    # rtkit is optional but recommended
+    security.rtkit.enable = true;
     # Enable sound using pipewire-pulse
     services.pipewire = {
       enable = true;