Add Istio Sidecar Injection

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: add-sidecar-injection-namespace
  annotations:
    policies.kyverno.io/title: Add Istio Sidecar Injection
    policies.kyverno.io/category: Istio
    policies.kyverno.io/severity: medium
    kyverno.io/kyverno-version: 1.8.0
    policies.kyverno.io/minversion: 1.6.0
    kyverno.io/kubernetes-version: "1.24"
    policies.kyverno.io/subject: Namespace
    policies.kyverno.io/description: In order for Istio to inject sidecars to workloads deployed into Namespaces, the label `istio-injection` must be set to `enabled`. As an alternative to rejecting Namespace definitions which don't already contain this label, it can be added automatically. This policy adds the label `istio-inject` set to `enabled` for all new Namespaces.
spec:
  rules:
    - name: add-istio-injection-enabled
      match:
        any:
          - resources:
              kinds:
                - Namespace
      mutate:
        patchStrategicMerge:
          metadata:
            labels:
              istio-injection: enabled