Use docker (bug 1075456)

Fixes [bug 1075456](https://bugzilla.mozilla.org/show_bug.cgi?id=1075456)
I would suggest avoiding prefixing commands that update deps at all as they don't really serve any purpose as they will only update the one container created by fig run.

The only things that make sense in new containers are db updates (assuming shared db data) and things like test runs.