Emacs without X

[petr-tik]

Noticed one of your todos suggested building emacs without GUI as a way to reduce the docker layer.

Below are the instructions on how to configure and build emacs from source without images and X features

https://gist.github.com/danielrmeyer/35702082b07d5eb75f3754ce8985e907

Might be worth investigating making your own Docker base layer with a GUI-less emacs build

Other options are
https://github.com/jgkamat/airy-docker-emacs
https://github.com/flycheck/docker-tools/blob/master/emacs-cask/Dockerfile