ServiceConfig kills services like DA on stop

[Wondertan]

Roller version

latest

OS

Desn't matter

Processor Architecture

Doesn't matter either

Others

No response

Steps to reproduce it

roller run and then Ctrl+C

Expected result

I expect services/sub-processes to be not killed but gracefully shut down.

Actual result

DA process is killed. This is bad because there are a bunch of things the process has to do on stop, like flush unwritten buffers or send certain p2p messages.

Relevant log output

No response

Notes

In general, the current design of ServiceConfig and its interaction with run command and the DA interface do not consider graceful shutdown, and making it work would require refactoring. The simplest thing, though, could be changing the Cancel func on the CommandContext field here to send an interrupt signal to subprocess. The proper fix would be waiting for all the services to finish(cmd.Run) with some form of WaitGroup in the run cmd. Idiomatically, you would also need to make it so it respects context cancellation and still kills the process after a timeout, like in https://github.com/golang/go/blob/cacac8bdc5c93e7bc71df71981fdf32dded017bf/src/cmd/go/script_test.go#L1091-L1098