Posture check: GCP Kubernetes cluster shielded GKE node with Secure Boot disabled
Query: ```config from cloud.resource where cloud.type = 'gcp' AND api.name = 'gcloud-container-describe-clusters' AND json.rule = nodePools[?any(config.shieldedInstanceConfig.enableSecureBoot does not exist or config.shieldedInstanceConfig.enableSecureBoot is false)] exists```