Add GitLab-CI pipeline

JIRA INFRA-4955

.gitlab-ci.yml

+.runner_tags: &runner_tags
+  tags:
+    - docker
+
+stages:
+  - build
+  - release
+
+build:
+  <<: *runner_tags
+  stage: build
+  image: registry.esss.lu.se/ics-docker/centos-dev:7
+  script:
+    - ./build.sh
+  artifacts:
+    expire_in: 24h
+    paths:
+      - RPMS
+
+release:
+  <<: *runner_tags
+  stage: release
+  image: registry.esss.lu.se/ics-docker/jfrog:latest
+  script:
+    - jfrog rt config artifactory --url=${ARTIFACTORY_URL} --apikey=${ARTIFACTORY_API_KEY}
+    - jfrog rt upload "RPMS/x86_64/xdma-dkms-*.rpm" rpm-ics/centos/7/x86_64/
+  only:
+    - tags