Update app.py

app.py

@@ -14,7 +14,7 @@ from jinja2 import Environment, FileSystemLoader
 import numpy as np
 from sentence_transformers import CrossEncoder
 from huggingface_hub import InferenceClient
-
+from os import getenv
 
 from backend.query_llm import generate_hf, generate_openai
 from backend.semantic_search import table, retriever