edit jupytext github action to preserve cell ids

avoids unnecessary commits

.github/workflows/build-notebooks.yaml

@@ -19,13 +19,13 @@ jobs:
           python -m pip install -U pip
           python -m pip install jupytext nbconvert
 
-
       - name: Build notebooks
         run: |
-          jupytext --to ipynb --update-metadata '{"jupytext":{"cell_metadata_filter":"all"}}' solution.py
+          jupytext --to ipynb --update-metadata '{"jupytext":{"cell_metadata_filter":"all"}}' --update solution.py
+          jupytext --to ipynb --update-metadata '{"jupytext":{"cell_metadata_filter":"all"}}' --update solution.py --output exercise.ipynb
 
-          jupyter nbconvert solution.ipynb --TagRemovePreprocessor.enabled=True --TagRemovePreprocessor.remove_cell_tags solution --to notebook --output exercise.ipynb
-          jupyter nbconvert solution.ipynb --TagRemovePreprocessor.enabled=True --TagRemovePreprocessor.remove_cell_tags task --to notebook --output solution.ipynb
+          jupyter nbconvert solution.ipynb --ClearOutputPreprocessor.enabled=True --TagRemovePreprocessor.enabled=True --TagRemovePreprocessor.remove_cell_tags task --to notebook --output solution.ipynb
+          jupyter nbconvert exercise.ipynb --ClearOutputPreprocessor.enabled=True --TagRemovePreprocessor.enabled=True --TagRemovePreprocessor.remove_cell_tags solution --to notebook --output exercise.ipynb
 
       - uses: EndBug/add-and-commit@v9
         with: