GraalVM support

[Baterka]

Hello!
Amazing container! Can you add graalvm support? I see that your itzg/minecraft-server container already supports it.

[itzg]

Thanks for submitting this. I'll consider adding it; however, it's surprisingly tedious to add for possibly little benefit. I'll have to bring in conditional Oracle Linux base image build support in addition to the nice and easy Debian base image used now. Good news I've already solved all that in the other image.