Implement BullMQ for background job processing

* new REDIS_URL environment variable

apps/server/src/integrations/mail/mail.service.ts

@@ -3,16 +3,24 @@ import { MAIL_DRIVER_TOKEN } from './mail.constants';
 import { MailDriver } from './drivers/interfaces/mail-driver.interface';
 import { MailMessage } from './interfaces/mail.message';
 import { EnvironmentService } from '../environment/environment.service';
+import { InjectQueue } from '@nestjs/bullmq';
+import { QueueName, QueueJob } from '../queue/constants';
+import { Queue } from 'bullmq';
 
 @Injectable()
 export class MailService {
   constructor(
     @Inject(MAIL_DRIVER_TOKEN) private mailDriver: MailDriver,
     private readonly environmentService: EnvironmentService,
+    @InjectQueue(QueueName.EMAIL_QUEUE) private emailQueue: Queue,
   ) {}
 
-  async sendMail(message: Omit<MailMessage, 'from'>): Promise<void> {
+  async sendEmail(message: Omit<MailMessage, 'from'>): Promise<void> {
     const sender = `${this.environmentService.getMailFromName()} <${this.environmentService.getMailFromAddress()}> `;
     await this.mailDriver.sendMail({ from: sender, ...message });
   }
+
+  async sendToQueue(message: Omit<MailMessage, 'from'>): Promise<void> {
+    await this.emailQueue.add(QueueJob.SEND_EMAIL, message);
+  }
 }