feat(nixos): add Palworld Tracion guest

configs/nixos/modules/services/steamcmd.nix

@@ -59,6 +59,12 @@
       default = [ ];
       description = "UDP ports opened for the game service.";
     };
+
+    tcpPorts = lib.mkOption {
+      type = lib.types.listOf lib.types.port;
+      default = [ ];
+      description = "TCP ports opened for the game service.";
+    };
   };
 
   config = lib.mkMerge [
@@ -159,6 +165,7 @@
         };
 
         networking.firewall.allowedUDPPorts = service.udpPorts;
+        networking.firewall.allowedTCPPorts = service.tcpPorts;
       }
     ))
   ];