[ci] Use env var to control whether to use S3 bucket in CI (#13634)

tests/engine/test_skip_tokenizer_init.py

@@ -2,22 +2,19 @@
 
 import pytest
 
-from vllm.config import LoadFormat
 from vllm.entrypoints.llm import LLM
 from vllm.sampling_params import SamplingParams
 
-from ..conftest import MODEL_WEIGHTS_S3_BUCKET
 
-
-@pytest.mark.parametrize("model",
-                         [f"{MODEL_WEIGHTS_S3_BUCKET}/distilbert/distilgpt2"])
+@pytest.mark.parametrize("model", ["distilbert/distilgpt2"])
 def test_skip_tokenizer_initialization(model: str):
     # This test checks if the flag skip_tokenizer_init skips the initialization
     # of tokenizer and detokenizer. The generated output is expected to contain
     # token ids.
-    llm = LLM(model=model,
-              skip_tokenizer_init=True,
-              load_format=LoadFormat.RUNAI_STREAMER)
+    llm = LLM(
+        model=model,
+        skip_tokenizer_init=True,
+    )
     sampling_params = SamplingParams(prompt_logprobs=True, detokenize=True)
 
     with pytest.raises(ValueError, match="cannot pass text prompts when"):