Idea: Support creation of optimized docker images

[raphiz]

Provide an easy way to build optimised layered images - or at least document how to do it.

My idea is to have a base layer with the JDK/JRE + Bash, at least one "vendor" layer (all linked dependencies squeezed into one layer) and an "app" layer containing only the unlinked jars. Users can then further subdivide the vendor layer into multiple layers, e.g. to group Spring/Kotlin dependencies.

This might also be a good point to (optimally) configure a JRE to be used at runtime instead of a JDK.

Related links:

• https://github.com/wagoodman/dive
• https://github.com/nlewo/nix2container