the docker one actually sucks to use, as apparent here. had to add a lot of
shit just for it to work, but the heroku registry client has gone stale and is
causing issues with our dependencies. didn't expect this to be that hard, but
it's over now. good thing we aren't even using this code ^_^. we need to at
some point start limiting image sizes and remember this not being fun to
figure out to begin with, so anyway, now this works and we don't have to
wrestle with different versions of docker in deps (hopefully) anymore.
