Requires adding a Redis host password through `redis_host_password`.
If you are updating you existing Nextcloud, you might have to manually update the `<nextcloud-data-volume>/config/config.php` and replace `memcache...` properties with:
```
'memcache.distributed' => '\OC\Memcache\Redis',
'memcache.local' => '\OC\Memcache\Redis',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' => array(
'host' => 'redis',
'port' => 6379,
),
```
Co-authored-by: Jan Beilicke <dev@jotbe.io>
Reviewed-on: #4