refactor: use secret for ALFRED_URL

app.py

@@ -2,12 +2,13 @@ from io import BytesIO
 import gradio as gr
 import pandas as pd
 import requests
+import os
 from matplotlib.image import imread
 from ast import literal_eval
 
 
-ALFRED_URL = "http://106.254.240.186:30007"
-# ALFRED_URL = "http://192.168.1.11:30007"
+# hf 의 secret 으로 설정, 로컬 테스트시에는 내부 ip 사용
+ALFRED_URL = os.getenv("ALFRED_URL", "http://192.168.1.11:30007")
 
 
 selected_columns = ["ecg_id", "patient_id", "age", "sex", "scp_codes", "report"]