Mvn Site Plugin is missing in pom.xml of lib_groovy Template

[Steffengreiner]

Describe the bug

The lib_groovy Template includes the gmavenplus-plugin for automatic groovydoc generation in the section of its pom.xml.
This plugin is dependent on the inclusion of the maven site plugin as a in the pom.xml.
Since this plugin is missing the report generation fails during the github action here.

To Reproduce
1.) Checkout the development branch of data-model-lib
2.) Use the command mvn site in the root directory
3.) Watch the World (or at least the build) break

Expected behavior
After inclusion of the maven site plugin the github action should run without issues and the groovydocs should be generated as expected.

[Steffengreiner]

Check if the steps outlined in this issue were addressed