title: Different assets in cli config for ng serve and ng build [Angular 5]
body: <p>Is possible to use different assets array when i use <code>ng build</code>?</p>
  
  <pre><code>"assets": [
    "assets",
    "favicon.ico",
    {
      "glob": "**/*",
      "input": "../externalDir",
      "output": "./app/",
      "allowOutsideOutDir": true
    }
  ]
  </code></pre>
  
  <p>In my case when i use <code>ng build</code> i want to build only this:</p>
  
  <pre><code>"assets": [
    "assets",
    "favicon.ico"
  ]
  </code></pre>