Add GitHub Actions CI build (#11454)

Add GitHub Actions CI build (#11454)

This PR adds a CI build using GitHub Actions.
Besides having a backup for Jenkins, it will also make it easy for contributors to use a GitHub Actions build with their fork.

It features the following:

* Uncluttered simple build progress like we used with Travis CI
* Uploads the full build log and SAT summary report so they can be downloaded for further analysis
* Uses a Maven repository cache to speed up builds (first build takes a bit longer)
* Has some maven.wagon configuration options to prevent Maven Central artifact download issues from Azure
* Uses a matrix so we can easily add builds for other OS-es or newer Java LTS versions in the future

Signed-off-by: Wouter Born <github@maindrain.net>