schutzbot: fix update github status f42

There seems to be a change in behaviour from Fedora 41 to Fedora 42.
When a script is executed remotely a non-interactive session is created.
However, the user session with noTTY in Fedora F42 is picked up by the
`who`, `w` & `users` commands.

Since we run a remote script that checks for logged in users with the
`who` command, the `update_github_status.sh` script blocks and creates
an endless loop. This happens because the session only closes once the
remote script has finished executing.

The fix is a bit ugly, but we can filter this session out by checking
for user sessions that don't have a terminal device `?`.

schutzbot/update_github_status.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # if a user is logged in to the runner, wait until they're done
-while (( $(who -s | wc -l)  > 0 )); do
+while (( $(who -u | grep -v '?' | wc -l)  > 0 )); do
     echo "Waiting for user(s) to log off"
     sleep 30
 done