Refactor packaging job
Refactor packaging job

There is no need to use the prepareScript helper if we use triple
double quotes.

Also colorize the output.

Change-Id: Ie7152ecbd8a7570434d243ef1db8eba6b4a24125

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts