[REF-2760] print statements inside backend event handler do not appear in azure docker logs

[masenf]

Describe the bug
In a docker deployment on Azure Container App service, print calls don't seem to show up in the output. Stdout appears to be suppressed, which makes debugging issues very difficult.

More investigation needed.

_{From SyncLinear.com | REF-2760}

[masenf]

Okay i think we have a workaround here:

Set the environment variable PYTHONUNBUFFERED=1

This will allow the stdout to go directly to the logs.