Replace SingletonConfigurable classes with Configurable

.github/workflows/pythonapp.yml

@@ -31,11 +31,15 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
-          # path: ./dist/*.whl
-          # include-hidden-files: true
-          # retention-days: 1
           name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
+<<<<<<< Updated upstream
           path: ./wheelhouse/*.whl
+||||||| Stash base
+          path: ./dist/*.whl
+=======
+          path: ./wheelhouse/*.whl
+          if-no-files-found: warn
+>>>>>>> Stashed changes
 
   build_sdist:
     name: Build source distribution
@@ -47,12 +51,14 @@ jobs:
         run: |
           pip install -U build
           python -m build --sdist
-
-      - uses: actions/upload-artifact@v4
+          
+      - name: Upload sdist result
+        uses: actions/upload-artifact@v4
         with:
+          name: cibw-sdist
           path: dist/*.tar.gz
-          include-hidden-files: true
-          retention-days: 1
+          if-no-files-found: warn
+
 
   upload_pypi:
     needs: [build_wheels, build_sdist] # , build_sdist