ple, to define a custom template that injects the <code>GREETING</code> environment variable into the <code>istio-proxy</code> container:</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  name: istio
spec:
  values:
    sidecarInjectorWebhook:
      templates:
        custom: |
          spec:
            containers:
            - name: istio-proxy
              env:
              - name: GREETING
                val