Re-add and move bundle install out of the sudo heredoc

Author: neddp

ci/tasks/os-images/build.sh

@@ -33,6 +33,7 @@ fi
 sudo chown -R ubuntu .
 sudo chown -R ubuntu:ubuntu /mnt
 sudo chmod u+s "$(which sudo)"
+bundle install --local
 sudo --preserve-env --set-home --user ubuntu -- /bin/bash --login -i <<SUDO
 bundle exec rake stemcell:build_os_image[$OPERATING_SYSTEM_NAME,$OPERATING_SYSTEM_VERSION,$OS_IMAGE]
 SUDO