build: add circleci & gitlabci

This does some basic formal testing, just like done for packages.git.
Later compiling of device tree files, checking kmods or other more
specific tests could be done. However this is a first step to CI.

Signed-off-by: Paul Spooren <mail@aparcar.org>
1 job for ci in 15 seconds (queued for 2 minutes and 42 seconds)
Status Job ID Name Coverage
  Test
passed #350
doc

00:00:15