Support copied repos

[joonas-fi]

Currently we "namespace" containers by assigning names like tbdev-<project name>-default where the more general form is tbdev-<project name>-<builder name>

Project name comes from turbobob.json

The problem is when you copy a repo, both repos share same project name. Thus the container names collide.

As a workaround I've temporarily changed the project name in the copied repo. That gets tiresome.

Should maybe make that form tbdev-<project name>-<builder name>-<path digest>