force multiprocessing start method to be "spawn" at the start of extension

Author: andrii-i

jupyter_scheduler/extension.py

@@ -1,4 +1,7 @@
 import asyncio
+import multiprocessing
+
+multiprocessing.set_start_method("spawn", force=True)
 
 from jupyter_core.paths import jupyter_data_dir
 from jupyter_server.extension.application import ExtensionApp