Adding 'await' - fixes the release version

The release version of the app was crashing on startup. This was because the environment variables were not being set before the app was started. This was because the code was not waiting for the environment variables to be set before trying to connect to the GraphQL client.

Author: Rushour0

lib/main.dart

@@ -10,8 +10,8 @@ import 'package:overlay_support/overlay_support.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  EnvironmentConfig.loadEnvVariables();
-  SystemChrome.setPreferredOrientations([
+  await EnvironmentConfig.loadEnvVariables();
+  await SystemChrome.setPreferredOrientations([
     DeviceOrientation.portraitUp,
     DeviceOrientation.portraitDown,
   ]);