XXX Demo Commit

Shows how the variable will be used in production. To demo this,
add REACT_APP_GOOGLE_ANALYTICS_KEY to your `.env.backend` file.

Run `cibuild` and `server`, then check in :6543/ and :8081/
that the variable is logged to the console.

src/app/public/index.html

@@ -32,6 +32,10 @@
     <title>Open Apparel Registry (beta)</title>
     <!-- Environment Variables -->
     <script src="%PUBLIC_URL%/web/environment.js"></script>
+    <!-- TODO: Replace with actual Google Tag Manager snippet -->
+    <script>
+        console.log(window.ENVIRONMENT.REACT_APP_GOOGLE_ANALYTICS_KEY);
+    </script>
     <!--
       Rollbar Configuration
       https://docs.rollbar.com/docs/browser-js