ci: Add gitlab-ci.yml

Create a gitlab-ci.yml from .travis.yml.

Changes are debian instead of ubuntu as base image.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
11 jobs for next in 31 minutes and 7 seconds (queued for 16 seconds)
Status Job ID Name Coverage
  Build
passed #148808
arm-4.14-release

00:27:27

passed #148807
arm-4.19-release

00:29:29

passed #148809
arm-4.4-cip-head

00:21:50

passed #148811
arm64-4.14-release

00:26:47

passed #148810
arm64-4.19-release

00:31:07

passed #148817
powerpc-4.19-release

00:19:28

passed #148814
x86-4.14-release

00:16:49

passed #148812
x86-4.19-cip-head

00:17:08

passed #148813
x86-4.19-cip-release

00:17:02

passed #148815
x86-4.4-cip-head

00:16:04

passed #148816
x86-4.4-cip-release

00:16:04