microk8s charm uses deprecated unit-get

[vernhart]

When trying to figure out how to influence which IP address gets included in the generated kubeconfig file, I realized that the charm action is using "unit-get public-address". Since unit-get is deprecated, should this be modified to use network-get? Either on the cluster interface or a newly defined interface, maybe public?

[vernhart]

The blocking issue here is that "unit-get public-address" returns the public ingress address which isn't always available from any of the network-get commands. Some discussion about that can be seen here: https://bugs.launchpad.net/juju/+bug/1924780/comments/13