Update app.py

app.py

@@ -284,6 +284,7 @@ def start_training(
         try:
             # Inject HF_TOKEN into the new space
             api.add_space_secret(repo_id=new_space_id, key="HF_TOKEN", value=hf_token)
+            api.add_space_secret(repo_id=new_space_id, key="HF_DATASET", value=destination_folder)
             print(f"Added HF_TOKEN secret to {new_space_id}")
         except Exception as e:
             print(f"Failed to add HF_TOKEN secret to new space: {e}")