introduce development mode

[ndeloof]

What I did
docker compose up --dev enable development mode, which allows to publish additional ports (typically: a remote debugger, or administration UI) and override the service command (to switch to yarn dev)

While less powerful, this offers an alternative to a sibling compose-dev.yaml file and need to specify multiple compose files on command line

example:

services:
  app:
     build: .
     develop:
        watch:
           - path: src
             target: /app
        command: yarn dev --port 4001
        ports:
           - 4001:4001

Related issue

(not mandatory) A picture of a cute animal, if possible in relation to what you did