Fixed config issue

src/core/config.py

@@ -238,7 +238,7 @@ class ConfigManager:
         config = copy.deepcopy(config)
         
         for key, value in os.environ.items():
-            if key.startswith('RAG_') and key != 'RAG_ENV':
+            if key.startswith('RAG_') and key not in ('RAG_ENV', 'RAG_CONFIG'):
                 # Remove prefix and split by double underscore
                 path_parts = key[4:].lower().split('__')