config db.js

db.js

@@ -9,6 +9,7 @@ const db = mysql.createConnection({
   user: process.env.DB_USER || 'root',
   password: process.env.DB_PASSWORD || '',
   database: process.env.DB_NAME || 'inventory_db',
+  port: process.env.DB_PORT || '3306',
 });
 
 db.connect((err) => {