Differentiate insider builds from stable builds

Summary: Each build will have an embedded file specifying the target release channel for the build. This allows us to do some customisations, e.g. show "Insiders" label in the title and enable Sandy by default for insiders builds.

Reviewed By: jknoxville

Differential Revision: D25399045

fbshipit-source-id: 8e26d0754d0713ced823f86b30b54491d55b4d97

desktop/app/src/init.tsx

@@ -20,6 +20,7 @@ import {Store} from './reducers/index';
 import dispatcher from './dispatcher/index';
 import TooltipProvider from './ui/components/TooltipProvider';
 import config from './utils/processConfig';
+import appConfig from '../src/fb-stubs/config';
 import {initLauncherHooks} from './utils/launcher';
 import {setPersistor} from './utils/persistor';
 import React from 'react';
@@ -40,6 +41,7 @@ import {
   _setGlobalInteractionReporter,
 } from 'flipper-plugin';
 import isProduction from './utils/isProduction';
+import ReleaseChannel from './ReleaseChannel';
 
 if (process.env.NODE_ENV === 'development' && os.platform() === 'darwin') {
   // By default Node.JS has its internal certificate storage and doesn't use
@@ -116,7 +118,10 @@ function init() {
     store,
     {name: 'loadTheme', fireImmediately: true, throttleMs: 500},
     (state) => ({
-      sandy: GK.get('flipper_sandy') && !state.settingsState.disableSandy,
+      sandy:
+        (GK.get('flipper_sandy') ||
+          appConfig.getReleaseChannel() === ReleaseChannel.INSIDERS) &&
+        !state.settingsState.disableSandy,
       dark: state.settingsState.darkMode,
     }),
     (theme) => {