[Misc] Getting and passing ray runtime_env to workers (#22040)

Signed-off-by: Rui Qiao <ruisearch42@gmail.com>

vllm/ray/lazy_utils.py

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+
+def is_ray_initialized():
+    """Check if Ray is initialized."""
+    try:
+        import ray
+        return ray.is_initialized()
+    except ImportError:
+        return False
+
+
+def is_in_ray_actor():
+    """Check if we are in a Ray actor."""
+
+    try:
+        import ray
+        return (ray.is_initialized()
+                and ray.get_runtime_context().get_actor_id() is not None)
+    except ImportError:
+        return False