Add archiver IP to docker-compose file

nginx doesn't start if it fails to resolve a hostname defined as
proxy_pass.
Adding the archiver to the hosts allow to start the server
outside ESS where the archiver is not resolved.
This is for local testing. The archiver won't be accessible without VPN.

docker-compose.yml

@@ -15,6 +15,8 @@ services:
     volumes:
       - ./PythonServer:/app
       - python-data:/var/www/data
+    extra_hosts:
+      - "archiver-01.tn.esss.lu.se:172.16.225.16"
   web:
     image: registry.esss.lu.se/ics-software/ess-public-screens/nginx:master
     build:
@@ -25,6 +27,8 @@ services:
       - python-data:/usr/share/nginx/data:ro
     depends_on:
       - python_server
+    extra_hosts:
+      - "archiver-01.tn.esss.lu.se:172.16.225.16"
     ports:
       - "8000:8000"