topologies mix and match these two.

For a standard Kubernetes deployment, both CA and discovery will use JWT authentication, with a token automatically
[generated and rotated by Kubernetes](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#service-account-token-volume-projection).

For discovery, the JWT token will be read directly from a file and sent as is. For CA, this logic is a bit more complex,

contexts:
- context:
    cluster: local
    user: istio-cni
  name: istio-cni-context
current-context: istio-cni-context
kind: Config
preferences: {}
users:
- name: istio-cni
  user:

Sergei Gavrilov <******@****.***> 1657207540 +0200

Xiaopeng Han <******@****.***> 1686841337 +0800

		caContents, err := os.ReadFile(caFile)
		if err != nil {
			return kubeconfig{}, err
		}
		cluster.CertificateAuthorityData = caContents
	}

	token, err := os.ReadFile(constants.ServiceAccountPath + "/token")
	if err != nil {
		return kubeconfig{}, err
	}

	const contextName = "istio-cni-context"
	const clusterName = "local"
	const userName = "istio-cni"
	kcfg := &api.Config{

      - emptyDir:
          medium: Memory
        name: local-certs
      - name: istio-token
        projected:
          sources:
            - serviceAccountToken:
                audience: {{ .Values.global.sds.token.aud }}
                expirationSeconds: 43200
                path: istio-token
      # Optional: user-generated root
      - name: cacerts
        secret:
          secretName: cacerts

      priorityClassName: system-node-critical
      terminationGracePeriodSeconds: {{ .Values.terminationGracePeriodSeconds }}
      volumes:
      - name: istio-token
        projected:
          sources:
          - serviceAccountToken:
              path: istio-token
              expirationSeconds: 43200
              audience: istio-ca
      - name: istiod-ca-cert
        configMap:
          name: istio-ca-root-cert

	}
	versionCmd.Example = `  # Retrieve version information directly from the control plane, using token security
  # (This is the usual way to get the control plane version with an out-of-cluster control plane.)
  istioctl x version --xds-address istio.cloudprovider.example.com:15012

  # Retrieve version information via Kubernetes config, using token security
  # (This is the usual way to get the control plane version with an in-cluster control plane.)