Handle the case when redis mod cannot be installed/started

[danez]

Yesterday docker hub had an outage and the redis mod image couldn't be downloaded. I saw some "Offline" message in the logs, but the container still proceded and of course immich failed to connect to redis and was restarting in an endless loop. I had to wait till docker hub was working again and then i finally could start immich again.

It would be nice to have a failsafe when mods, which are required fail to install. Even if the container stops completely.