This uses the established abstractions to implement the usual
subcommands for the ImageUpdateAutomation type.
I've called the sub-subcommand in each case `image-update`, as a
fairly safe shorthand for the much longer `image-update-automation`.
Signed-off-by: Michael Bridgen <michael@weave.works>
This adds the create subcommand, without attempting any refactoring.
NB the TODO: the image/v1alpha1 API does not yet export a const for
the name of the kind. The field `RunInterval` will likely be changed
to `Interval` (with a value field), at some point, too.
Signed-off-by: Michael Bridgen <michael@weave.works>
