This role clones a bunch of repositories to /srv/workspace; it then tries to
run either `make` or `docker-compose up -d` in each of these repositories,
which are called "projects". Not really usable by anybody else.

This is how my web "projects" are set up; typically, a project is a repository
with a Makefile which calls docker-compose in a bunch of sub-directories. This
feels like a lame hack, but has worked pretty well so far.