fixup: set disk size for `privatek8s` node pools (#219)
fixup: set disk size for `privatek8s` node pools (#219)

Fixup of #218, resolves the following error:

> managedclusters.ManagedClustersClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: Code="VMCannotFitEphemeralOSDisk" Message="The virtual machine size Standard_D2as_v4 has a cache size of 53687091200 bytes and temporary disk size of 17179869184 bytes, but the OS disk requires 137438953472 bytes. Use a VM size with larger cache, larger temp disk, or disable ephemeral OS.
jenkins-infra/azure