Repositories on GitHub are now for issues only. I've set up my own installation of GitLab and moved all my repositories over to Git.Griefed.de. Make sure to check there first for the latest code before opening an issue on GitHub.
For questions, you can always join my Discord server and talk to me there.
A custom baseimage, based on docker-baseimage-ubuntu, built with the Ubuntu cloud image and S6-overlay with OpenJDK-17-JDK installed
This image also provides the Kotlin-compiler, so you can not only build/run Java applications, but also compile Kotlin.