Fix panic in node role determination#209
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The previous implementation used `strings.SplitAfter` and accessed index [1] unconditionally, causing an index out of range panic for labels like "node-role: master" that don't contain a "/". Use `strings.Cut` to safely extract the role from the label name when a "/" is present, and fall back to the label value otherwise. This correctly handles both `node-role.kubernetes.io/control-plane: ""`, `node-role.kubernetes.io/control-plane: true`, and `node-role: master` style labels.
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The previous implementation used
strings.SplitAfterand accessed index [1] unconditionally, causing an index out of range panic for labels like "node-role: master" that don't contain a "/".Use
strings.Cutto safely extract the role from the label name when a "/" is present, and fall back to the label value otherwise. This correctly handles bothnode-role.kubernetes.io/control-plane: "",node-role.kubernetes.io/control-plane: true, andnode-role: masterstyle labels.