Merge pull request RasaHQ#5740 from RasaHQ/build-changelog

Build changelog in test docs step

Author: erohmensing

.github/workflows/continous-integration.yml

@@ -104,6 +104,7 @@ jobs:
     - name: Test Docs 📃
       run: |
         make install-full
+        poetry run python -c "from scripts import release; release.generate_changelog('major.minor.patch')"
         export SPHINXBUILD=$(poetry run which sphinx-build)
         cd docs && make SPHINXBUILD=$SPHINXBUILD SPHINXOPTS="-W --keep-going -A html_theme=rasabaster" html