Minimum-footprint docker image with R 3.2.3 built in Ubuntu/Wily64

This is the working release of R 3.2.3 as busybox docker image.

Beware that your R code may break while other scripts work perfectly fine. You cannot rely on a cohesive environment as many dynamic libraries may be used, even in a hard-wired fashion.

Especially, avoid using Rscript at all - it is generated in the build environment and will not work in the image. Use bare bones R syntax instead:

R --slave --no-restore --file=script.r