chore: export connection from database file

Author: Victor

src/config/database.js

@@ -1,9 +1,11 @@
 import { Pool } from 'pg';
 
-const databaseConfig = new Pool({
+const connection = new Pool({
     host: process.env.DB_HOST,
     port: process.env.DB_PORT,
     user: process.env.DB_USERNAME,
     password: process.env.DB_PASSWORD,
     database: process.env.DB_DATABASE
-});
+});
+
+export { connection };