docker: added libervia e2e image and include it in `docker-compose_e2e`: The `libervia_e2e` image is based on main `libervia` one, and add, register and set the same test certificates as the ones used in `backend_e2e`.

version: "3.6"
services:

  sat:
    image: salutatoi/sat
    build: backend

  libervia:
    image: salutatoi/libervia
    build: libervia
    depends_on:
      - sat