Test private monorepo

This is a test for embedding a public (OSS) monorepo into a private monorepo via a git submodule.

Despite using git submodules, you should (in theory) not have to run any submodule-specific commands. Simply run yarn git ... instead of git ....

Things you can try

Clone this repo:
git clone git@github.com:lhorie/test-private-monorepo.git
cd test-private-monorepo
Explore proof of concept branches
yarn git branch # yes, yarn git, not just git
yarn git checkout rush