* Integrated example project for Mill into CI task
The example project uses Mills meta-build to resolve the snapshot version from a properties file.
The properties-file is now integrated into `release_version_update.sh`.
* Add coursier cache to actions-cache
* Split Mill tests into separate steps
* try to exclude problematic dependencies from maven-cache so they are downloaded by coursier
* clear m2-cache prior to mill execution
* Initial Mill support
* Updated Docs after changing git and pom settings to case classes
* Update Docs
* include Mill plugin in Docker build
* fix scaladoc
* fix cubic-dev-ai findings
