Install pandoc

.gitlab-ci.yml

@@ -76,7 +76,7 @@ pages:
   image: python:3.9
   stage: doc
   before_script:
-    - pip3 install sphinx==7.2.6 networkx==2.5 sphinxcontrib-apidoc==0.5.0 sphinx-rtd-theme==2.0.0 Jinja2==3.0.3 recommonmark==0.6.0 nbsphinx==0.9.3 nbconvert==6.4.3  sphinxcontrib-napoleon==0.7 sphinx-autoapi==3.0.0 graphviz ipython==7.20.0 json_schema_for_humans==0.40.3  --break-system-packages
+    - pip3 install sphinx==7.2.6 networkx==2.5 sphinxcontrib-apidoc==0.5.0 sphinx-rtd-theme==2.0.0 Jinja2==3.0.3 recommonmark==0.6.0 nbsphinx==0.9.3 nbconvert==6.4.3  sphinxcontrib-napoleon==0.7 sphinx-autoapi==3.0.0 graphviz ipython==7.20.0 json_schema_for_humans==0.40.3 pandoc --break-system-packages
   script:
     - mkdir public
     - make -C doc/ html