Adding end-to-end tests

The first test is testing a tricky cache scenario with the back when testing variables.
The end-to-end package used is testcafe.

docker-compose.yaml

@@ -17,6 +17,12 @@ services:
       - front
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
+    networks:
+      default:
+        aliases:
+          - 'play.workadventure.localhost'
+          - 'pusher.workadventure.localhost'
+          - 'maps.workadventure.localhost'
 
   front:
     image: thecodingmachine/nodejs:14
@@ -127,6 +133,7 @@ services:
       MAX_PER_GROUP: "MAX_PER_GROUP"
       REDIS_HOST: redis
       NODE_ENV: development
+      STORE_VARIABLES_FOR_LOCAL_MAPS: "true"
     volumes:
       - ./back:/usr/src/app
     labels: