Add MPD to audio service module

modules/services/audio/mpd.nix

@@ -0,0 +1,33 @@
+# Links & Resources:
+# - https://mpd.readthedocs.io/en/stable/user.html
+
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+
+  cfg = config.ccchh.services.audio;
+
+in
+
+{
+  config = mkIf cfg.enable {
+    services.mpd = {
+      enable = true;
+      network.listenAddress = "any";
+      extraConfig = ''
+        audio_output {
+          type "pipewire"
+          name "Pipewire"
+        }
+      '';
+    };
+
+    users.users.mpd.extraGroups = [ "pipewire" ];
+
+    networking.firewall = {
+      allowedTCPPorts = [ 6600 ];
+    };
+  };
+}