Solves an issue of hardwiring user/password in wordpress for database.

wp-config.php

@@ -20,13 +20,13 @@
 
 // ** MySQL settings - You can get this info from your web host ** //
 /** The name of the database for WordPress */
-define('DB_NAME', 'wordpress');
+define('DB_NAME', getenv('MYSQL_DATABASE'));
 
 /** MySQL database username */
-define('DB_USER', 'root');
+define('DB_USER', getenv('MYSQL_USER'));
 
 /** MySQL database password */
-define('DB_PASSWORD', 'wordpress');
+define('DB_PASSWORD', getenv('WORDPRESS_DB_PASSWORD'));
 
 /** MySQL hostname */
 define('DB_HOST', getenv('WORDPRESS_DB_HOST'));