title: How can you push a screen using only the navigation ref
body: <p>Using the react-navigation library, when you're on a screen that's part of a stack navigator you can use props.navigation.push(route name, params). I want to achieve the same thing, being able to push a new screen but from the root level where I take the NavigationContainer ref.</p>
  <p>So I have this code</p>
  <pre><code>   &lt;NavigationContainer ref={navigationRef}&gt;
         ... 
     &lt;/NavigationContainer&gt;
  </code></pre>
  <p>And I want to do something like</p>
  <pre><code>   navigationRef.push(routeName, params);
  </code></pre>
  <p>Unfortunately, I don't have the push method here. Is there a workaround for this?</p>