Creating a new build submodule

[ellioseven]

When creating a new build with:

# Create new build and commit to environment.
mkdir -p src/docroot
git init src
echo "<?php phpinfo();" >> src/docroot/index.php
git -C src add --all && git -C src commit -m "Create build"

This needs to be implemented separately as a git sub module.

[ellioseven]

Perhaps we should use regular clone instead of submodules?