Without this patch, we are using outdated images in kind cluster
setup.

This should fix it, by removing 1.17 cluster (which is not tested
anymore), and updating 1.19 images.

This allows us to test this branch with multiple kubernetes
versions.

Without this patch, we don't test on release whether kured actually
works and behave well.

This is a problem, as a functional issue could have been hidden by
a recent change, as our testing is minimalist (only test the
usability, not the functionality).
Instead of testing manually, we should ensure this in CI.

This fixes it by adding a github action which tests the previously
built artifacts before publishing a release. The job consume the helm
chart in our code tree  (note: this relies on the last released image),
and run a functional test triggering a coordinated restart of a
whole 5 node cluster deployed with kind, through github actions.

Note: The github action needs to reset docker configuration, else
the reboot of the node (a docker container in kind) will fail.
It will be correctly triggered, but the node will not come back up,
with its systemd log mentioning: "Failed to attach 1 to compat systemd cgroup".