update getDatabase to lookup DATABASE_TYPE env

lib/queries.js

@@ -6,7 +6,7 @@ const POSTGRESQL = 'postgresql';
 const MYSQL = 'mysql';
 
 export function getDatabase() {
-  return process.env.DATABASE_URL.split(':')[0];
+  return process.env.DATABASE_TYPE || process.env.DATABASE_URL.split(':')[0];
 }
 
 export async function getWebsiteById(website_id) {