.gitlab-ci.yml: produce .xml artifacts and use them within gitlab

6 jobs for feature/xml-artifacts-gitlab in 14 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Unit
passed #170837
unit

00:00:03

 
  Demo
passed #170842
demo

00:00:04

failed #170841
demo

failed #170840
demo

failed #170838
demo

 
  Coverage
passed #170839
coverage

00:00:06

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