Added runit and an example of using the image.
Added runit and an example of using the image.

A couple of things could be removed from the base (Debian) image,
but require "flattening" (exporting and importing of the image).
In a derived image you may drop the whole systemd infrastructure,
clean up /usr/share/man|doc|info|locale etc. Or use some automated
minification such as docker-slim.

wrwrwr/docker-flask-scipy,wrwrwr/docker-flask-scipy