CI: automatically compute image_key
Today it is a pain to configure image_key consistently with k8s_version and the intended OS.
We have work in progress to make this much better (#1101).
However, we won't land this for 1.1.1, and we won't backport this to 1.0.0 either.
This MR introduces some crude automatic computation for image_key
.
This is nowhere as good and flexible as what is being done in #1101, but it will help us manage our CI configurations more easily.
In particular it will close #1349 (closed) and avoid similar future config errors.
Commits:
- the first commit introduces the automatic computation
- the following ones clean up CI files that can be simplified now that image_key variants aren't needed anymore
Edited by Thomas Morin