gitlab-ci: upload built packages as artifacts

gitlab allows us to define artifacts that will be uploaded to gitlab and
available to download for some time.

Specify that the built packages should be uploaded to gitlab, along with
the public key.
5 jobs for !276 with upgrade-testing-kops in 2 minutes and 42 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
failed #2087
x86_64 docker-alpine allowed to fail
lint

00:00:18

 
  Build
passed #2091
ppc64le ci-build docker-alpine
build-ppc64le

00:00:26

passed #2090
s390x ci-build docker-alpine
build-s390x

00:00:26

passed #2089
x86 ci-build docker-alpine
build-x86

00:00:21

passed #2088
x86_64 ci-build docker-alpine
build-x86_64

00:02:21

 
Name Stage Failure
failed
lint Lint
No job log