Is your feature request related to a problem? Please describe.
Authentik does not work without redis. To archive real HA redis has to run in multi-master (custer) mode which does not support multiple Databases.

Describe the solution you'd like
Either allow all services to use the same redis db (I don't know if this is already an option) or allow to specify multiple redis connections (host,port,username,pw).

Describe alternatives you've considered

Additional context