🛜 feat: Redis Alt. DNS Lookup for Elasticache support #9263 (LibreChat-AI#400)

this is required when connecting to elasticache for ioredis
see "Special Note: Aws Elasticache Clusters with TLS" on this webpage:  https://www.npmjs.com/package/ioredis

Co-authored-by: Marc Amick <MarcAmick@jhu.edu>

Author: MarcAmick

pages/docs/configuration/redis.mdx

@@ -104,6 +104,14 @@ REDIS_URI=rediss://your-redis-host:6380
 # Provide CA certificate for verification
 REDIS_CA=/path/to/your/ca-certificate.pem
 ```
+### TLS with Elasticache
+
+Elasticache may need to use an alternate dnsLookup for TLS connections.  see "Special Note: Aws Elasticache Clusters with TLS" on this webpage: https://www.npmjs.com/package/ioredis
+
+```bash
+# Enable redis alternate dnsLookup
+REDIS_USE_ALTERNATIVE_DNS_LOOKUP=true
+```
 
 ## Advanced Options