Limit background services by process role

src/services/notification.service.ts

@@ -14,6 +14,10 @@ export class NotificationService implements OnModuleInit {
     ) { }
 
     async onModuleInit(): Promise<void> {
+        if (process.env.MASTER !== 'true') {
+            return;
+        }
+
         await this.discordService.notifyRestarted();
     }
 
@@ -21,4 +25,4 @@ export class NotificationService implements OnModuleInit {
         await this.discordService.notifySubscribersBlockFound(height, block, message);
         await this.telegramService.notifySubscribersBlockFound(address, height, block, message);
     }
-}
+}