Add logging for database connection status and host

src/index.js

@@ -34,6 +34,9 @@ const PORT = Number(process.env.PORT || 4000);
 
 async function ensureDbConnected() {
   try {
+    console.log('Ellenorizzuk az adatbazis kapcsolatot...');
+    console.log('HOST:', process.env.DB_HOST);
+
     const connection = await pool.getConnection();
     await connection.ping();
     connection.release();