add enforcement of generated binaries

[car-roll]

Locally, whenever the unit tests fail in the dockerfile, the entire build fails. On CI, however, the build goes green. This adds an enforcer to make sure the required binary files have been generated.

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your master branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[dwnusbaum]

I am not an expert on Maven plugins, but this approach seems good to me.