The ruby gem application "gorgeous", packaged in an alpine docker image.
To use, either invoke it as you would any docker-based application, or use one of the scripts below to make things a little easier on the keyboard. After that, you should be able to just run gorgeous --help and get the help information.
(/usr/bin/gorgeous)
#!/bin/sh
docker run -it --rm -v "$(pwd):/usr/work" aetheric/gorgeous $*
(c:/scripts/gorgeous.cmd)
@ECHO OFF
docker run -it --rm -v "%CD%:/usr/work" aetheric/gorgeous %*If all goes to plan, it's that easy.