add logic to check login for HF

Author: trujillm

charts/all/vllm-inference-service/templates/inference-service.yaml

@@ -37,7 +37,8 @@ spec:
             import os
             token = os.environ.get("HF_TOKEN")
             model = os.environ.get("MODEL_ID")
-            login(token=token)
+            if token:
+                login(token=token)
             snapshot_download(
                 repo_id=model,
                 local_dir="/cache/models"