Update app.py

app.py

@@ -4,7 +4,7 @@ import gradio as gr
 import os
 
 # Set your OpenAI API key here
-os.environ["OPENAI_API_KEY"] = 'Your Secret API Key'
+os.environ["OPENAI_API_KEY"] = os.getenv("OPENAI_API_KEY")
 
 def construct_index(directory_path):
     max_input_size = 4096