fix: use papermill

.github/workflows/checknb.yml

@@ -51,8 +51,16 @@ jobs:
         env:
           PYTHON: python
 
-      # Step to run Jupyter notebooks in specified subdirectories
+      # Install Papermill for executing notebooks
+      - name: Install Papermill
+        run: python -m pip install papermill
+
+      # Run all Jupyter notebooks using the wildcard, capture errors
       - name: Run Jupyter Notebooks
-        uses: jupyter-actions/run-notebook@v2.0.0
-        with:
-          path: "notebooks/**/*.ipynb"
+        run: |
+          EXIT_CODE=0
+          for notebook in $(find notebooks -name "*.ipynb"); do
+            echo "Running notebook: $notebook"
+            papermill "$notebook" /dev/null || EXIT_CODE=$?
+          done
+          exit $EXIT_CODE