Add support for Redis ACL

[pythoninja]

Describe the feature you'd like

ACL with username:password authentication was added by Redis recently. I want to configure a connection string using my custom username with password.

Currently, we can use an old AUTH method defined in the .env file:

REDIS_SERVERS="redis-host:6379:0:$5$Db./yjws2Eg1kqQa$5jIG"

My request is about extension of this syntax to include username, something like:

REDIS_SERVERS="redis-host:6379:0:bookstack-redis-user:$5$Db./yjws2Eg1kqQa$5jIG"

More info about ACL: https://redis.io/docs/management/security/acl/

Describe the benefits this would bring to existing BookStack users

With ACL, one can limit access only to specific keys, databases and do not rely on default settings.

Can the goal of this request already be achieved via other means?

AFAIK, no.

Have you searched for an existing open/closed issue?

• [X] I have searched for existing issues and none cover my fundamental request

How long have you been using BookStack?

3 months to 1 year

Additional context

No response