install pandoc

.github/workflows/documentation.yaml

@@ -23,6 +23,7 @@ jobs:
           version: "23.7.0"
     - name: Upgrade pip, install package, install requirements, build docs
       run: |
+        apt-get --allow-releaseinfo-change update -y && apt-get install pandoc
         pip install --upgrade pip
         pip install .
         pip install -r ./docs/requirements.txt