I installed the Phabricator VM (I'm so glad someone made this, by the way!).
I've self-hosted Phabricator before, and the standard install involves cloning the arcanist, libphutil and phabricator git repositories.
To update my install, I'd simply
git pull in each directory. The bitnami VM includes each of these directories, but they aren't git repositories.
Short version -- how do I keep my install up-to-date?