Use DOLOS_API_URL in healthcheck

Author: rien

docker-compose.yml

@@ -58,7 +58,7 @@ services:
     healthcheck:
       start_period: 2s
       interval: 10s
-      test: curl --fail http://localhost:3000/up || exit 1
+      test: curl --fail "$$DOLOS_API_URL/up" || exit 1
   worker:
     image: ghcr.io/dodona-edu/dolos-api
     # build: ./api/