Update environment configuration and refactor OPC activities for async handling

- Expanded the .env file with configurations for MongoDB, Postgres, MlFlow, and Temporal.
- Refactored OPC class methods to be asynchronous, including init_opc, write_data, manage_output_tags, and shutdown.
- Updated the worker to initialize OPC asynchronously and adjusted shutdown handling for activities.

laborious/worker/worker.py

@@ -64,6 +64,9 @@ async def main():
         notification_handler=notification_handler
     )
 
+    logger.custom_info('Initializing OPC...', metadata)
+    await activities.init_opc()
+
     logger.custom_info(
         f'Starting SDK Metrics Server on port {SDK_METRICS_PORT}...', metadata)
 
@@ -74,7 +77,7 @@ async def main():
         )
     )
 
-    logger.custom_info('Starting Temporal Client...', metadata)
+    logger.custom_info(f'Starting Temporal Client at {host}...', metadata)
 
     temporal_client = await client.Client.connect(
         target_host=host,
@@ -151,7 +154,7 @@ async def main():
         if notification_handler:
             notification_handler.shutdown()
         if activities:
-            activities.shutdown()
+            await activities.shutdown()
         # Exit with a non-zero status code to indicate failure to Kubernetes
         metrics.APP_UP.labels(pod_id=POD_ID).set(0)  # Mark app as DOWN
         sys.exit(1)