Preload host keys for github.com
Preload host keys for github.com

This should allow for cloning from github without a human manually
having to verify and accept host keys after a rebuild

maratoid/kraken-ci,maratoid/kraken-ci,maratoid/kraken-ci,samsung-cnct/kraken-ci,samsung-cnct/kraken-ci,samsung-cnct/kraken-ci