title: Angular.json styles "inject" is not a valid property
body: <p>I'm trying to add some custom styles to <code>angular.json &gt; &quot;projects&quot; &gt; &quot;app-name&quot; &gt; &quot;architect&quot; &gt; &quot;build&quot; &gt; &quot;options&quot; &gt; &quot;styles&quot;</code> but when I add my style object, the <code>Property inject is not allowed.</code></p>
  <pre><code>{
     &quot;input&quot;: &quot;src/assets/theme/client-a-style.css&quot;,
     &quot;bundleName&quot;: &quot;client-a&quot;,
     &quot;inject&quot;: true
  }
  </code></pre>
  <p>I'm using Angular v6.0.8</p>