cli (base): new `a_quit` method to run async cleaning methods: it may be necessary to run some async cleaning method (e.g. if bridge is needed), this new method handles async cleaning method, and will be called when `SystemExit` is used, or if `a_quit` is called explicitely. rel 426

version: "3.6"
services:

  prosody:
    image: libervia/prosody:demo
    build: prosody-demo

  backend:
    image: libervia/backend:dev-demo
    build: backend-dev-demo

  web:
    image: libervia/web:dev-demo
    build: libervia-web-dev-demo