ci: Add gitlab-ci configuration.

3 jobs for meklort/gitlab-ci in 18 seconds
Status Job ID Name Coverage
  Build
failed #185
build1

00:00:18

failed #183
build1

00:00:17

 
  External
failed build

 
Name Stage Failure
failed
build1 Build
                   May only be specified once.
--config <cfg> = For multi-configuration tools, choose <cfg>.
--clean-first = Build target 'clean' first, then build.
(To clean only, use --target 'clean'.)
--use-stderr = Ignored. Behavior is default in CMake >= 3.0.
-- = Pass remaining options to the native tool.
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit status 1