Update app.py

Added changes to read gss_credentials from the Hugging Face secrets environment

app.py

@@ -41,8 +41,15 @@ def gs_client_from_secrets():
     if not GS_AVAILABLE:
         return None
     
-    creds_str = st.secrets.get("gss_credentials", None)
+    # Try reading from Hugging Face environment variable first
+    creds_str = os.environ.get("gss_credentials", "")
+    
+    if not creds_str:
+        # Fallback to Streamlit Cloud secrets
+        creds_str = st.secrets.get("gss_credentials", "").strip()
+
     if not creds_str:
+        logging.error("No Google Sheets credentials found.")
         return None
 
     try: