Fix import assertion in ARC smoke test for accurate validation

Author: calvinp0

dockerfiles/docker_tests/test_docker_smoke.py

@@ -10,7 +10,7 @@ def test_import_arc():
     """Test that ARC can be imported in the docker image."""
     try:
         import arc
-        assert hasattr(arc, '__version__')
+        assert hasattr(arc, '__file__')
     except ImportError as e:
         pytest.fail(f"ImportError: {e}")