Fix bug found on debian 11 / python 3.9 droplet

Author: olethanh

src/aleph/vm/orchestrator/supervisor.py

@@ -140,7 +140,11 @@ async def stop_all_vms(app: web.Application):
 
 def run():
     """Run the VM Supervisor."""
+    # Loop creation set here to avoid bug with Future on different loop
+
     loop = asyncio.new_event_loop()
+    # apparently needed for Python 3.9 / Debian 11
+    asyncio.set_event_loop(loop)
     settings.check()
 
     engine = setup_engine()