watch: rebuild also rebuilds depends_on services

[dgageot]

Description

In compose watch, editing a service's code rebuilds not only that service but also the services it depends_on. Those dependencies are then rebuilt but not restarted.

Steps to reproduce

git clone https://github.com/dgageot/bug-compose

services:
 backend:
 build: ./backend
 frontend:
 build: ./frontend
 depends_on:
 - backend
 develop:
 watch:
 - action: rebuild
 path: ./frontend

docker compose up --build --watch
# edit ./frontend/main.go

Expected

Only frontend is rebuilt and restarted. backend is left untouched.

Actual

backend is rebuilt too (but not restarted).