Middleman (https://middlemanapp.com) build environment
The aim of this project is to provide a docker container with all tools needed to build our website via Middleman. Therefore no local installation of middleman and it's dependencies is neccessary.
The script middleman-shell contains the startup command for the middleman shell and mounts the current dir
to /middleman. You get a bash in the container, where you can run your Middleman commands.