add env for chatqna vllm (#655)

Signed-off-by: chensuyue <suyue.chen@intel.com>

ChatQnA/docker/xeon/compose_vllm.yaml

@@ -72,6 +72,7 @@ services:
       LANGCHAIN_API_KEY: ${LANGCHAIN_API_KEY}
       LANGCHAIN_TRACING_V2: ${LANGCHAIN_TRACING_V2}
       LANGCHAIN_PROJECT: "opea-retriever-service"
+      HUGGINGFACEHUB_API_TOKEN: ${HUGGINGFACEHUB_API_TOKEN}
     restart: unless-stopped
   tei-reranking-service:
     image: ghcr.io/huggingface/text-embeddings-inference:cpu-1.2