add links to test

docker-compose.test.yml

@@ -57,12 +57,12 @@ services:
     image: docker.fet.at/fet2020django
     container_name: test_fet2020
     environment:
-     HOST_NAME: "test.fet.at"
-     DEBUG: "False"
-     SECRET_KEY: "sadfreigjopi4qgjpjrp"
-     MYSQL_USER: "user"
-     MYSQL_PASSWORD: "hgu"
-     ETHERPAD_GROUP: "g.snlbqn7S6ksRbom3"
+      HOST_NAME: "test.fet.at"
+      DEBUG: "False"
+      SECRET_KEY: "sadfreigjopi4qgjpjrp"
+      MYSQL_USER: "user"
+      MYSQL_PASSWORD: "hgu"
+      ETHERPAD_GROUP: "g.snlbqn7S6ksRbom3"
     depends_on:
       mysql:
         condition: service_healthy
@@ -73,6 +73,8 @@ services:
     volumes:
       - /srv/APIKEY.txt:/app/etherpad/APIKEY.txt
       - /srv/files:/app/files
+    links:
+      - "mysql:database"
 volumes:
   ep-mysql-volume:
     driver: local