Add logging while waiting for services

[mjagyo]

Introduce a --log flag for docker compose wait and docker compose up --wait to emit progress output while services are starting.

[ndeloof]

I don't think we need a new --log flag, which would only apply in combination with --wait. We can just attach to containers when --wait is set; users who prefer to keep it quiet can redirect output, rely on start --wait or maybe use --attach=.
Doing so you don't need a new flag not new AP attributes, the challenge becomes getting composeService.up to stop early, after container all get healthy (which is managed in start

[mjagyo]

I don't think we need a new --log flag, which would only apply in combination with --wait. We can just attach to containers when --wait is set; users who prefer to keep it quiet can redirect output, rely on start --wait or maybe use --attach=. Doing so you don't need a new flag not new AP attributes, the challenge becomes getting composeService.up to stop early, after container all get healthy (which is managed in start

okay noted, will work on it.