Use KUBERNETES_VERSION variable to set k8s cluster version #761

Job	Run time
Azure Kubernetes Service	1h 9m 28s
exclude-fmt-errorf / exclude-fmt-errorf	2s
shellcheck / shellcheck	13s
checkgomod / checkgomod	11s
golangci-lint / golangci-lint	13s
yamllint / yamllint	11s
Azure Tanzu	45m 36s
	1h 55m 54s

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