feature request: support redis cluster and additional options for cache

[alekitto]

What problem did you meet?

Redis cache configuration is quite limited:

• redis cluster cannot be used
• tls options (such as using self-signed certs, provide custom CA, etc) cannot be set in REDIS_URL env variables

Describe what you'd like Logto to have

REDIS_URL environment variable should be parsed to accept multiple hosts and redis_cluster query parameter to support connection to redis cluster. Ex:

redis:?host=127.0.0.1&host=192.168.2.3&redis_cluster=1

should establish a connection to a redis cluster with root nodes 127.0.0.1 and 192.168.2.3.

At the same time reject_unauthorized=0 could be passed to accept self-signed certificates and cert, key, certroot parameters could be used to specify the files to read to connect via mTLS or with a custom CA.

I can provide a PR to support these options in case you're intrested in implementing this.

[wangsijie]

Thanks for the suggestion. We're always open to contributions. If you or anyone else is interested in working on this, we'd be happy to review a pull request. Thanks again for your input!