Fix paths

Author: mdboom

.github/workflows/coverage.yml

@@ -126,7 +126,7 @@ jobs:
 
       - name: Set cuda package install root
         run: |
-          echo "CUDA_PYTHON_ROOT=$(python -c 'import cuda; print(cuda.__path__[0])')" >> $GITHUB_ENV
+          echo "CUDA_PYTHON_ROOT=$(.venv/bin/python -c 'import cuda; print(cuda.__path__[0])')" >> $GITHUB_ENV
           echo "REPO_ROOT=$(pwd)" >> $GITHUB_ENV
 
       - name: Run cuda.pathfinder tests