Migrate tests from microk8s to ck8s.
Bootstrap a controller on a manual cloud, and add ck8s to available
clouds.
Upgrade juju to 3.5
Configure ephemeral device when available, configure k8s to use it for
local storage.
Change-Id: Ief491f8b339307f0c43d11639336b02d9f6479b4
Signed-off-by: Guillaume Boutry <guillaume.boutry@canonical.com>
0bda4738e3