Propagate signals to subprocess

[dacevedo12]

In non-interactive environments, signals are sent to the container's main process under certain circumstances.

I.e, kubernetes sends a SIGTERM which can be handled to gracefully shutdown applications before the pod gets stopped

Given that makes is the main process, it should propagate those signals to the underlying application being executed

https://github.com/fluidattacks/makes/blob/main/src/cli/main/cli.py#L477