(No idea if this is actually possible; if not, we'll need to upstream a request.)

Right now we're using gerrit with a very minimal set of people who can create repos; this means that the need to create a .gitreview file as the first commit is fine, if a chore. When we roll out Phabricator's code review tools, we'll want to open up repo creation a bit (but probably not entirely), so the need to create a .arcreview file as the first commit into an empty repo will be a really confusing step each time.