added a validation check to the action to see which condition is not triggering

Author: Austin Glover

.github/workflows/verify_extension_build.yml

@@ -31,6 +31,24 @@ jobs:
         pip install -r .github/workflows/requirements_cuda_ci.txt
         pip install -e .
 
+    - name: Validate CUDA environment
+      run: |
+        python - <<'PY'
+        import os
+        import sys
+        import torch
+
+        cuda_home = os.environ.get("CUDA_HOME")
+        if not cuda_home:
+            sys.exit("CUDA_HOME is not set; CUDA toolkit may not be available.")
+        print(f"CUDA_HOME={cuda_home}")
+
+        cuda_version = getattr(torch.version, "cuda", None)
+        if not cuda_version:
+            sys.exit("torch.version.cuda is empty; torch may not have CUDA support.")
+        print(f"torch.version.cuda={cuda_version}")
+        PY
+
     - name: Test extension build via import 
       run: |
-        pytest tests/import_test.py -k test_extension_built
+        pytest tests/import_test.py -k test_extension_built