build(): test new build sys, add script

packages/backend/git.json

@@ -0,0 +1,4 @@
+{
+    "tag": "1.0.0",
+    "commit": "test"
+}

packages/backend/scripts/make-git.js

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2025 Aleksander <alekswilc> Wilczyński (aleks@alekswilc.dev)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * See LICENSE for more.
+ */
+
+import fs from 'node:fs/promises';
+
+(async () => {
+    await fs.writeFile('git.json', JSON.stringify({
+        tag: process.env.TAG,
+        commit: process.env.COMMIT,
+    }))
+})();