WIP: Try uploading Tox artifacts for debugging

Author: ldionne

.github/workflows/tox.yaml

@@ -31,3 +31,12 @@ jobs:
       run: tox -e mypy
     - name: Tox py3
       run: tox -e py3
+
+    - name: Upload tox artifacts
+      uses: actions/upload-artifact@v4
+      if: always()
+      with:
+        name: tox-results-${{ matrix.python-version }}
+        path: |
+          .tox/
+        retention-days: 2