gitlab-ci: add a job that only build things needed for testing

For turnip and RADV testing, we will need a debugoptimized build
without UBSAN. This introduces meson-testing which builds only the
things that are needed by the test stage.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
1 file changed