fix: push validation (#495)
fix: push validation (#495)

- run `.gradlew test` instead of `./gradlew build` to avoid dist tasks
- rename action and job
- update checkout action version to v2
skaldarnar/TerasologyLauncher,skaldarnar/TerasologyLauncher,MovingBlocks/TerasologyLauncher,skaldarnar/TerasologyLauncher,MovingBlocks/TerasologyLauncher