spoke/compose.yaml: add ExitOnForwardFailure so autossh reconnects when the port forward fails

spoke/compose.yaml

@@ -10,6 +10,7 @@ services:
       autossh -M 0 -NT
       -o "ServerAliveInterval=60"
       -o "ServerAliveCountMax=3"
+      -o "ExitOnForwardFailure=yes"
       -R 11111:localhost:22
       -i /home/armbian/.ssh/hubkey
       armbian@hub.example.com