[CI][AMD] Skip 4 GPUs testgroup ray tests (#33305)

Signed-off-by: Ryan Rock <ryan.rock@amd.com>
Co-authored-by: TJian <tunjian.tan@embeddedllm.com>

tests/distributed/test_utils.py

@@ -10,6 +10,7 @@ import torch
 import vllm.envs as envs
 from vllm.distributed.device_communicators.pynccl import PyNcclCommunicator
 from vllm.distributed.utils import StatelessProcessGroup
+from vllm.platforms import current_platform
 from vllm.utils.network_utils import get_open_port
 from vllm.utils.system_utils import update_environment_variables
 from vllm.utils.torch_utils import cuda_device_count_stateless
@@ -32,6 +33,8 @@ class _CUDADeviceCountStatelessTestActor:
 def test_cuda_device_count_stateless():
     """Test that cuda_device_count_stateless changes return value if
     CUDA_VISIBLE_DEVICES is changed."""
+    if current_platform.is_rocm():
+        pytest.skip("Skip for ROCm because Ray uses HIP_VISIBLE_DEVICES.")
     actor = _CUDADeviceCountStatelessTestActor.options(  # type: ignore
         num_gpus=2
     ).remote()