Inside WORKDIR/build/buildscripts we need the full .git/ directory to be available in order for the "revision" file to take the correct git SHA.

(cherry picked from commit 09e2383e5173ab33d3e1914174f3fe6f48b2c26a)
Remove stale comment.

(cherry picked from commit f4e3456993536653bc2b815c8f46eb50f311b3cb)