[coreboot] Unit tests are now live on our build infrastructure

[Patrick Georgi]

Hi everybody,

Just a quick heads up: the unit tests in tests/ are now built and run on
every commit pushed to review.coreboot.org.

Consider this a good opportunity to improve our stability by contributing
tests! Jan is writing a tutorial on writing tests that you can find for now
at review.coreboot.org/41727.

If anything is unclear with the tutorial, don't hesitate to comment on the
change.

Regards,
Patrick