update dev.yml

Author: ntoulemonde

.github/workflows/dev.yaml

@@ -43,6 +43,12 @@ jobs:
         with:
           node-version: '18'
 
+     - uses: actions/setup-python@v4  # for post on onyxia
+        with:
+          python-version: '3.10' # Version range or exact version of a Python version to use, using SemVer's version range syntax
+
+      - run: pip install jupyter nbformat  # for post on onyxia
+
       - name: Set up Quarto
         uses: quarto-dev/quarto-actions/setup@v2