nixos/tautulli: add option to open firewall

nixos/modules/services/misc/tautulli.nix

@@ -32,6 +32,12 @@ in
         description = lib.mdDoc "TCP port where Tautulli listens.";
       };
 
+      openFirewall = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Open ports in the firewall for Tautulli.";
+      };
+
       user = mkOption {
         type = types.str;
         default = "plexpy";
@@ -74,6 +80,8 @@ in
       };
     };
 
+    networking.firewall.allowedTCPPorts = mkIf cfg.openFirewall [ cfg.port ];
+
     users.users = mkIf (cfg.user == "plexpy") {
       plexpy = { group = cfg.group; uid = config.ids.uids.plexpy; };
     };