build: setup docker containers for development

app/server/middlewares/limitedUsers.js

@@ -0,0 +1,12 @@
+import dbClient from '../db/index.js';
+
+async function limitedUsers(_, res, next) {
+  const countQuery = await dbClient.query('SELECT COUNT(*) FROM users');
+  if(countQuery.rows[0].count > 0) {
+    res.redirect('/users/login');
+  }
+
+  next();
+}
+
+export default limitedUsers;