trying a trick

.gitlab-ci.yml

@@ -31,6 +31,7 @@ build-documentation:
   image: i10git.cs.fau.de:5005/pycodegen/pycodegen/documentation
   script:
     - pip install mkdocs mkdocs-material mkdocstrings[python]
+    - export PYTHONPATH=`pwd`
     - mkdocs build
   tags:
     - docker