Fix uploading artifacts.

Author: jelmer

.github/workflows/pythonpublish.yml

@@ -49,8 +49,10 @@ jobs:
           pip install twine
       - name: Download wheels
         uses: actions/download-artifact@v2
+      - name: Display structure of downloaded files
+        run: ls -R
       - name: Publish wheels
         env:
           TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
           TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
-        run: twine upload wheelhouse/*.whl
+        run: twine upload artifact/*.whl