add missing logger

Author: bryansan-local

samples/web-app-sql-database/python/src/database.py

@@ -92,6 +92,8 @@ def from_env(cls) -> 'SqlHelper':
         if not any([client_id, client_secret, tenant_id, server, database, username, password]):
             raise ValueError("You properly need to define environment variables.")
 
+        logger.info("Environment variables loaded successfully")
+        
         return cls(
             server=server,
             database=database,