initial commit
Initial Makefile to help building the image + keys together
Ignore generated ssh keys

...as they really don't need to end up in the repo :)
set DEBIAN_FRONTEND=noninteractive so apt doesn't complain...

...about the lack of a tty.
add ppa:git-core/ppa manually...

...so we don't need to install apt-add-repository and all it comes along with.