FEATURE: Support graceful server shutdown

[gustaff-weldon]

Thank you for taking time to open a new issue. Please answer a few questions to help us fix it faster. You can delete text that is irrelevant to the issue.

Is this a bug report or a feature request?

Feature request

If this is a new feature request, please describe it below

I have tried running start-server-and-test with docker compose.

I have noticed that very often when tests are finished, docker does not manage to stop the containers as (it seems) its process is abruptly killed before it gracefully shuts down.

I would like o be able to tell start-server-and-test to send sigint only and wait for the server to shutdown and then exit. Could be a flag like --await-server-shutdown or alike