encode method
Implementation
Map<String, Object?> encode() => {
if (labels != null) 'labels': labels!.toTfJson(),
if (operatingSystem != null)
'operating_system': operatingSystem!.toTfJson(),
if (nodeConfigs != null)
'node_configs': [for (final e in nodeConfigs!) e.encode()],
if (taints != null) 'taints': [for (final e in taints!) e.encode()],
};