Update app.py

app.py

@@ -33,7 +33,7 @@ def process_model(
     )
     print("Model downloaded successully!")
 
-    metadata_update = f"python llama.cpp/gguf-py/scripts/gguf_set_metadata.py {MODEL_NAME}/{file_path} {key} {value}"
+    metadata_update = f"python3 llama.cpp/gguf-py/scripts/gguf_set_metadata.py {MODEL_NAME}/{file_path} {key} {value}"
     subprocess.run(metadata_update, shell=True)
     print(f"Model metadata {key} updated to {value} successully!")