Update redis.config.php

Signed-off-by: marceljd <support@dihosting.ch>

.config/redis.config.php

@@ -5,6 +5,7 @@ if (getenv('REDIS_HOST')) {
     'memcache.locking' => '\OC\Memcache\Redis',
     'redis' => array(
       'host' => getenv('REDIS_HOST'),
+      'port' => getenv('REDIS_PORT')?: 6379,
     ),
   );
 }