You can read more about this project in this KIE blog entry: https://blog.kie.org/2022/08/testing-spring-boot-kie-server-images.html
Docker must be installed to run the tests.
You can run the application by simply starting the default profile (-Pjib)
mvn clean install
or with the profile buildpack
mvn clean install -Pbuildpack
Use -DnoRemove option for skipping the removal of the image and dive into it.