node: fix known labels #8
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First, this addresses a problem where nodes are not allowed to set their role. I don't know how you got this working because it doesn't work for me: get a 403 Forbidden when registering the node. Maybe it's the k3s thing that's more permissive?
Then, we set the known label
kubernetes.io/ostoLinux, which is what workloads usually refer to (PodSpec.nodeSelector) to ensure they're not placed on nodes running other OSes, ie Windows.