Feature Request: Support External Redis Configuration in Helm Chart

[buihutrungkinh]

Hi team,

I'd like to request a feature enhancement for the current Helm chart of Higress.

Feature request: Add support to configure Redis as an external service instead of always deploying it internally.

Why it's needed:

In production environments, teams often manage Redis as a separate service (e.g., via AWS ElastiCache, Redis Cluster, or shared Redis deployments).

Decoupling Redis improves scalability and aligns with infrastructure best practices.

Suggested approach:

Add a Helm chart flag such as:

redis:
enabled: false
external:
host: your-redis-host
port: 6379
password: yourpassword

When redis.enabled: false, skip deploying the Redis subchart and use the values under redis.external.
I’d be happy to help contribute this if the team agrees it's a valid enhancement.

Thanks!