Build: get most build issues out of the way.
Build: get most build issues out of the way.

Someone on the internet tricked me into thinking I could clone git
repositories using the ADD instruction. This required me to reorder most of
the Dockerfile.
Also, some other issues were fixed. However, building still doesn't work
because Debian is injecting inconvenient compiler flags into gem installs.

der-scheme/dmptool-docker