fix: Switch from Azure Service Bus to RabbitMQ for task queue

Azure Service Bus is incompatible with Kombu 5.x used by Celery 5.3.6.
All versions of azure-servicebus 7.x have breaking module structure changes
that prevent Kombu from connecting, causing production worker failures.

Changes:
- Remove hardcoded LOKOLE_QUEUE_BROKER_SCHEME=azureservicebus from docker-compose.prod.yml
- Add RabbitMQ service (rabbitmq:management-alpine) to production compose
- Worker now depends on RabbitMQ service
- Add URL encoding for broker credentials to handle special characters (/, =, +)
- Add rabbitmq_data volume for queue persistence
- Uses existing credentials (LOKOLE_EMAIL_SERVER_QUEUES_SAS_NAME/KEY) for RabbitMQ auth

Production setup:
Add these two lines to secrets/azure.env:
  LOKOLE_QUEUE_BROKER_SCHEME=amqp
  LOKOLE_EMAIL_SERVER_QUEUES_NAMESPACE=rabbitmq

This fixes the production worker failures with TypeError and RuntimeError
when trying to connect to Azure Service Bus.

Author: dahagag

docker/docker-compose.prod.yml

@@ -7,7 +7,6 @@ x-shared-secret-environment:
     HOST: 0.0.0.0
     WEBAPP_PORT: 8080
     LOKOLE_STORAGE_PROVIDER: AZURE_BLOBS
-    LOKOLE_QUEUE_BROKER_SCHEME: azureservicebus
     CONNEXION_SPEC: dir:/app/opwen_email_server/swagger
     CELERY_QUEUE_NAMES: all
     TESTING_UI: "False"
@@ -44,3 +43,21 @@ services:
     image: ascoderu/opwenserver_app:latest
     command: ["/app/docker/app/run-celery.sh"]
     <<: *shared-secret-environment
+    depends_on:
+      - rabbitmq
+
+  rabbitmq:
+    image: rabbitmq:management-alpine
+    environment:
+      # Use same creds from azure.env for convenience
+      RABBITMQ_DEFAULT_USER: ${LOKOLE_EMAIL_SERVER_QUEUES_SAS_NAME}
+      RABBITMQ_DEFAULT_PASS: ${LOKOLE_EMAIL_SERVER_QUEUES_SAS_KEY}
+    volumes:
+      - rabbitmq_data:/var/lib/rabbitmq
+    restart: always
+    # Optional: expose management UI
+    # ports:
+    #   - 15672:15672
+
+volumes:
+  rabbitmq_data:

opwen_email_server/config.py

@@ -1,3 +1,5 @@
+from urllib.parse import quote
+
 from environs import Env
 
 env = Env()
@@ -65,6 +67,9 @@
 QUEUE_BROKER_PASSWORD = env('LOKOLE_EMAIL_SERVER_QUEUES_SAS_KEY')
 QUEUE_BROKER_HOST = env('LOKOLE_EMAIL_SERVER_QUEUES_NAMESPACE')
 if env('LOKOLE_QUEUE_BROKER_SCHEME', ''):
-    QUEUE_BROKER = f"{QUEUE_BROKER_SCHEME}://{QUEUE_BROKER_USERNAME}:{QUEUE_BROKER_PASSWORD}@{QUEUE_BROKER_HOST}"
+    # URL-encode credentials to handle special characters
+    username = quote(QUEUE_BROKER_USERNAME, safe='')
+    password = quote(QUEUE_BROKER_PASSWORD, safe='')
+    QUEUE_BROKER = f"{QUEUE_BROKER_SCHEME}://{username}:{password}@{QUEUE_BROKER_HOST}"
 else:
     QUEUE_BROKER = env('LOKOLE_QUEUE_BROKER_URL', '')