We use a docker-based workflow to get consistent runs. Note that we use
stretch images for newer ruby versions and do some ssl hackery - more
recent debian versions see SSL test failures related to unsupported
ciphers, etc. Rather than debug them now, we ignore them - they're not
likely related directly to the code we're testing.
We also hack up the ruby docker image; because they do this strange
thing where they install gems globally into one bundle. It messes up
this build process, so we undo it to the best of our ability.
Andrew Hayworth