feat: add uxplay (airplay)

system/modules/airplay.nix

@@ -0,0 +1,39 @@
+{ pkgs, ... }:
+{
+  networking.firewall = {
+    allowedTCPPorts = [
+      7000
+      7001
+      7100
+    ];
+    allowedUDPPorts = [
+      5353
+      6000
+      6001
+      7011
+    ];
+  };
+
+  environment.systemPackages = with pkgs; [
+    uxplay
+  ];
+
+  systemd.user.services.uxplay = {
+    serviceConfig = {
+      ExecStart = "${pkgs.uxplay}/bin/uxplay -p";
+    };
+  };
+
+  services.avahi = {
+    enable = true;
+    openFirewall = true;
+    nssmdns4 = true;
+    publish = {
+      enable = true;
+      addresses = true;
+      workstation = true;
+      userServices = true;
+      domain = true;
+    };
+  };
+}