fix: add MAPBOX_ACCESS_TOKEN env var to demo docker-compose

Author: luandro

docker/demo/docker-compose.yml

@@ -135,6 +135,7 @@ services:
       USE_LOCAL_MAP_SERVER: 'true'
       OFFLINE_MAP_STYLE: ${OFFLINE_MAP_URL}
       HOST_HOSTNAME: ${HOST_HOSTNAME}
+      MAPBOX_ACCESS_TOKEN: ${MAPBOX_ACCESS_TOKEN}
       SECRET_KEY_BASE: "a845b372237fe58988e8fb7698b9a7b61f8cc7581dc685387ff1cb8ec5f250d57b733379d53f5c3e7b816d0bf0fdf5f7b02558c64b932903e5ec3fbe10c4b205"
     volumes:
       - bundler:/usr/local/bundle