Use environment variable for OpenAI API key

app.py

@@ -1,8 +1,13 @@
 import streamlit as st
 import openai
 
-# Set OpenAI API key
-openai.api_key = "Replace with your actual API key"  
+# Get the OpenAI API key from the environment variable
+openai.api_key = os.getenv("OPENAI_API_KEY")
+
+# Raise an error if the API key is missing
+if not openai.api_key:
+    raise ValueError("⚠️ OpenAI API key is missing! Add it in Hugging Face environment variables.")
+  
 
 # Streamlit UI
 st.set_page_config(page_title="AI Job Interview Coach", layout="centered")