Update app.py

app.py

@@ -201,6 +201,7 @@ class OptimizedRAGLoader:
         return retriever_function
 
 # Initialize components
+mistral_api_key = os.getenv("mistral_api_key")
 llm = ChatMistralAI(
     model="mistral-large-latest",
     mistral_api_key=mistral_api_key,