gitlab-ci: Add CI/CD configuration

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
1 job for CI/x86_64 in 16 minutes and 35 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
failed build #95619

00:16:35

 
Name Stage Failure
failed
build Build
Merging .gitlab-ci/fragment.cfg
#
# merged configuration written to .config (needs make)
#
$ make olddefconfig
Makefile:607: arch/amd64/Makefile: No such file or directory
make: *** No rule to make target 'arch/amd64/Makefile'. Stop.
Cleaning up file based variables
ERROR: Job failed: exit code 1