title: how to override the istio-proxy option in the app deployment?
body: <p>I want to set --connectTimeout of istio-proxy to be 2s, other than the default 10s. Is it possible to override the option value defined in the istio-sidecar-injector configMap? </p>
  
  <pre><code>containers:
    - name: istio-proxy
      image: [[ annotation .ObjectMeta `sidecar.istio.io/proxyImage`  "registry.cn-beijing.aliyuncs.com/aliacs-app-catalog/proxyv2:1.0.5"  ]]
  
      ports:
      - containerPort: 15090
        protocol: TCP
        name: http-envoy-prom
  
      args:
      - proxy
      - sidecar
      - --configPath
      - [[ .ProxyConfig.ConfigPath ]]
      - --binaryPath
      - [[ .ProxyConfig.BinaryPath ]]
      - --serviceCluster
      [[ if ne "" (index .ObjectMeta.Labels "app") -]]
      - [[ index .ObjectMeta.Labels "app" ]]
      [[ else -]]
      - "istio-proxy"
      [[ end -]]
      - --drainDuration
      - [[ formatDuration .ProxyConfig.DrainDuration ]]
      - --parentShutdownDuration
      - [[ formatDuration .ProxyConfig.ParentShutdownDuration ]]
      - --discoveryAddress
      - [[ annotation .ObjectMeta `sidecar.istio.io/discoveryAddress` .ProxyConfig.DiscoveryAddress ]]
      - --discoveryRefreshDelay
      - [[ formatDuration .ProxyConfig.DiscoveryRefreshDelay ]]
      - --zipkinAddress
      - [[ .ProxyConfig.ZipkinAddress ]]
      - --connectTimeout
      - [[ formatDuration .ProxyConfig.ConnectTimeout ]]
      - --proxyAdminPort
      - [[ .ProxyConfig.ProxyAdminPort ]]
      [[ if gt .ProxyConfig.Concurrency 0 -]]
      - --concurrency
      - [[ .ProxyConfig.Concurrency ]]
      [[ end -]]
  ...
  </code></pre>