of: Add a GitLab CI config file for unittests

This adds a GitLab CI config file running the DT unittest in a usermode
Linux build. The corresponding CI job can be found here:

https://gitlab.com/robherring/linux-dt-unittest/pipelines

This CI job can be duplicated by others by creating a kernel repo on a
GitLab instance and configuring GitLab CI to use
drivers/of/.gitlab-ci.yml config file.

Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rob Herring <robh@kernel.org>
1 file changed