GitLab-CI: fix versiondocs section

After the removal of the old Python-API, the Python package must be built so
that it can be used to produce the Example figures.

.gitlab-ci.yml

@@ -45,7 +45,7 @@ versiondocs:
     - hugo version
     - mkdir build
     - cd build
-    - time cmake .. -DCMAKE_CXX_COMPILER_LAUNCHER=ccache -DCMAKE_PREFIX_PATH="$PYPLAT;$QTCMAKE" -DBATCH_MODE=ON
+    - time cmake .. -DCMAKE_CXX_COMPILER_LAUNCHER=ccache -DCMAKE_PREFIX_PATH="$PYPLAT;$QTCMAKE" -DBA_PY_PACKAGE=ON -DBATCH_MODE=ON
     - time make -j8
     - time make -j8 webdoc
     - rm -rf ~www/ba/git-main/hugo-public