KOP-2149 Try out docker service

.gitlab-ci.yml

@@ -5,6 +5,10 @@ variables:
   MAVEN_DEPLOY_CLI_OPTS: "--no-transfer-progress"
   MAVEN_OPTS: "-Dmaven.repo.local=.m2/repository"
 
+services:
+  - name: kopsh-docker-dockerhub.repo-ex.zcdi.dataport.de/docker:dind
+    alias: docker
+
 cache:
   paths:
     - .m2/repository/