code: def test_shared_memory(podman_docker_cluster):
      """Test shared memory."""
  
      container_id = podman_docker_cluster
      cmd = [
          "python",
          "tests/test_shared_memory.py",
          "--image",
          NESTED_IMAGE_NAME,
      ]
      run_in_container([cmd], container_id)
  
file_path: ray/python/ray/tests/test_runtime_env_container.py
imports: import sys
  import pytest
  import ray
  from ray.tests.conftest import *
  from ray.tests.conftest_docker import *
  from ray.tests.conftest_docker import run_in_container, NESTED_IMAGE_NAME
label_desc: Use image node_id 2 for calling a global function with example usage: test_shared_memory(podman_docker_cluster) without return types