Update set_env.sh (#644)

Author: yinghu5

ChatQnA/docker/xeon/set_env.sh

@@ -12,6 +12,7 @@ export TEI_RERANKING_ENDPOINT="http://${host_ip}:8808"
 export TGI_LLM_ENDPOINT="http://${host_ip}:9009"
 export REDIS_URL="redis://${host_ip}:6379"
 export INDEX_NAME="rag-redis"
+export REDIS_HOST=${host_ip}
 export MEGA_SERVICE_HOST_IP=${host_ip}
 export EMBEDDING_SERVICE_HOST_IP=${host_ip}
 export RETRIEVER_SERVICE_HOST_IP=${host_ip}