feat: additional option to provide other host for upgrader

updater.py

@@ -4,8 +4,9 @@ from dotenv import load_dotenv
 
 load_dotenv()
 
+host = os.getenv('DB_HOST_UPGRADE') if os.getenv('DB_HOST_UPGRADE') else os.getenv('DB_UPGRADE')
 conn = psycopg2.connect(
-    host=os.getenv('DB_HOST'),
+    host=host,
     database=os.getenv('DB_NAME'),
     user=os.getenv('DB_USER'),
     password=os.getenv('DB_PASSWORD'),