Update app.py

app.py

@@ -37,14 +37,11 @@ app.add_middleware(
 
 # Load environment variables
 APP_ID = os.getenv("GITHUB_APP_ID")
-PRIVATE_KEY_PATH = os.getenv("GITHUB_PRIVATE_KEY_PATH", "private-key.pem")
+PRIVATE_KEY = os.getenv("GITHUB_PRIVATE_KEY")
 
 # Initialize GitHub App authentication
-if APP_ID and os.path.exists(PRIVATE_KEY_PATH):
-    with open(PRIVATE_KEY_PATH, "r") as f:
-        private_key = f.read()
-    
-    github_auth = GitHubAppAuth(APP_ID, private_key)
+if APP_ID and PRIVATE_KEY:
+    github_auth = GitHubAppAuth(APP_ID, PRIVATE_KEY)
     token_manager = TokenManager(github_auth)
 else:
     github_auth = None