By adding `exec` to the entrypoint bash script for the application, we can trap an EXIT from the script and execute our custom `on_exit` method with checks if the application process is busy before terminating, waiting up to 10 seconds. We don't need to trap `TERM` so that's been removed again.
Written by:
@servingupaces
@tlwr
This is so that retry-tasks queue, which can have quite a lot of
load, has its own worker, and other queues are paired with queues
that flow similarly:
- letter-tasks with create-letters-pdf-tasks
- job-tasks with database-tasks
cf v3 commands don't appear to support commands in manifest files. They
say that they do, but in practice they fail on cf v3-zdt-push with an
error message "No process types returned from stager". This can be
solved by moving the command from the manifest to a Procfile.
However, the Procfile is part of the source code, and as such is the
same for each app. To get around this, make the Procfile command invoke
a new wrapper script, which checks the NOTIFY_APP_NAME env var and then
calls the correct command
