The attached patch defines the new target `make print-gh-tuple` that prints `GH_TUPLE` for all git submodules of the default Git repository `${GH_ACCOUNT}/${GH_PROJECT}` when `USE_GITHUB=yes` is set.
Purpose: Simplify creation of the `GH_TARGET` tag when the repository has a lot of submodules.
It traverses and returns all submodules hierarchically.