Testing repository archive production
This new functional test provides end-to-end validation for heptapod#204 (closed), which in turn relies on the hgitaly service.
The pipeline for this MR will thus also prove for the first time that the hgitaly service is deployed correctly in the heptapod:testing
Docker image.
Closes heptapod#204 (closed)
Closes omnibus-heptapod#12 (closed)