Expose autograph container to the host

[willdurand]

In order to use RS localdev with Firefox and the remote-settings-devtools extension, we need to let Firefox access the autograph container. That involves 2 things:

1. adding 127.0.0.1 autograph to /etc/hosts since RS will return the URL to the cert chain with this host

2. exposing the port in the docker compose config

   diff --git a/docker-compose.yml b/docker-compose.yml
   index c0c8209..58c3ec9 100644
   --- a/docker-compose.yml
   +++ b/docker-compose.yml
   @@ -25,6 +25,8 @@ services:
        platform: linux/amd64
        image: mozilla/autograph
        user: root
   +    ports:
   +      - 8000:8000
        volumes:
          - autograph-certs:/tmp/autograph