TF-1248: add config support ios FCM to env.five

env.file

@@ -3,3 +3,4 @@ DOMAIN_REDIRECT_URL=http://localhost:3000
 WEB_OIDC_CLIENT_ID=teammail-web
 APP_GRID_AVAILABLE=supported
 FCM_AVAILABLE=supported
+IOS_FCM=unsupported

lib/main/utils/app_config.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:flutter_dotenv/flutter_dotenv.dart';
 
 class AppConfig {
@@ -13,12 +15,13 @@ class AppConfig {
   }
   static String appDashboardConfigurationPath = "configurations/app_dashboard.json";
   static bool get fcmAvailable {
-    final supported = dotenv.get('FCM_AVAILABLE', fallback: 'unsupported');
-    if (supported == 'supported') {
-      return true;
+    final supportedOtherPlatform = dotenv.get('FCM_AVAILABLE', fallback: 'unsupported');
+    final supportedIOSPlatform = dotenv.get('IOS_FCM', fallback: 'unsupported');
+    if (Platform.isIOS) {
+      return supportedIOSPlatform == 'supported';
+    } else {
+      return supportedOtherPlatform == 'supported';
     }
-    return false;
   }
   static String appFCMConfigurationPath = "configurations/env.fcm";
-
 }