ci: git config pull.ff only

Author: Borda

.azure/ipynb-publish.yml

@@ -118,6 +118,7 @@ jobs:
       - bash: |
           git config --global user.email "[email protected]"
           git config --global user.name "Azure Pipelines"
+          git config --global pull.ff only
           printf "commit hash:\n $(COMMIT_HASH)\n"
           printf "commit message:\n $(COMMIT_MSG)\n"
         displayName: "Set Git user"