make kioskUrl a settable option

sw/default.nix

@@ -38,6 +38,12 @@ in
       default = [];
       description = "Packages to exclude from the default list.";
     };
+
+    kioskUrl = mkOption {
+      type = types.str;
+      default = "https://ha.factory.uga.edu";
+      description = "URL to open in Chromium kiosk mode.";
+    };
   };
 
   config = mkIf cfg.enable (mkMerge [

sw/kiosk/services.nix

@@ -149,7 +149,7 @@
           --noerrdialogs \
           --disable-session-crashed-bubble \
           --disable-infobars \
-          https://ha.factory.uga.edu
+          ${config.modules.sw.kioskUrl}
       '';
     };
   };