change double quotes to single quotes in config.php-dist because double quotes break docker initialization

config.php-dist

@@ -3,11 +3,11 @@
 	// *** Database configuration (important!) ***
 	// *******************************************
 
-	define('DB_TYPE', "%DB_TYPE"); // pgsql or mysql
-	define('DB_HOST', "%DB_HOST");
-	define('DB_USER', "%DB_USER");
-	define('DB_NAME', "%DB_NAME");
-	define('DB_PASS', "%DB_PASS");
+	define('DB_TYPE', '%DB_TYPE'); // pgsql or mysql
+	define('DB_HOST', '%DB_HOST');
+	define('DB_USER', '%DB_USER');
+	define('DB_NAME', '%DB_NAME');
+	define('DB_PASS', '%DB_PASS');
 	define('DB_PORT', '%DB_PORT'); // usually 5432 for PostgreSQL, 3306 for MySQL
 
 	define('MYSQL_CHARSET', 'UTF8');