Update app.py

app.py

@@ -14,7 +14,7 @@ import tempfile
 import gradio as gr
 import openai
 
-os.environ["OPENAI_API_KEY"] = openai_api_key
+os.environ["OPENAI_API_KEY"] = os.getenv(openai_api_key)
 
 def get_empty_state():
  return {"knowledge_base": None}