Move ci to docker for consistency

[OlivierCazade]

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[openshift-ci]

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[jotak]

It conflicts with my other PR - and also needs to be done for the release workflow - so I've amended this one: #126

[codecov]

Codecov Report

Merging #129 (fddc459) into main (3df4bfe) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #129   +/-   ##
=======================================
  Coverage   41.32%   41.32%           
=======================================
  Files          31       31           
  Lines        2081     2081           
=======================================
  Hits          860      860           
  Misses       1183     1183           
  Partials       38       38           

Flag	Coverage Δ
unittests	41.32% <ø> (ø)

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