WIP: CI with gradle wrapper and image openjdk:15

Martin Langerequested to merge
feature/ci-with-gradle-wrapper into feature/project-structure-and-license

@reichold Seems I need some help here due to my limited Linux knowledge, as the CI fails when I try to use gradlew.

Using simply gradlew it states gradlew: command not found. Using ./gradlew it states ./gradlew: Permission denied. Solved with chmod +x ./gradlew.

When changing the image to obenjdk:15 it crashes even earlier and complies that wget was not found. Probably requires something equivalent to apt-get install wget, but that is also not available. Feels a bit dumb to fail on such basics...

Further, not sure if we should better use image adoptopenjdk.

FYI: It seems to have no noticable impact on CI duration. The CI with gradlew takes 18-40s, so no problem I think.

Edited by Martin Lange

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