Merged stable into default after publication of Production testing
This new mode of operation was developped on the stable branch of the tests, because we want to use it on instances running the current stable Heptapod series (0.19). The important refactor of the `heptapod.users` values was done as part of the effort. Obviously we also want all of this in the default branch. Took care of keeping the target image correct in CI configuration.
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