Add GitLab CI configuration

Port the existing CircleCI configuration to GitLab CI

changed milestone to %Sprint 68

changed time estimate to 1h

assigned to @amc203

added 1h of time spent at 2019-04-04

added workflowReview Required label

mentioned in merge request !38 (merged)

Clarification: this issue is talking about adding GitLab CI configuration to the template.

mentioned in commit 530182dc

closed via merge request !38 (merged)

removed workflowReview Required label