try

.docker/tester.yml

@@ -6,6 +6,9 @@ services:
       - type: bind
         source: ./cert
         target: /opt/caosdb/cert
+      - type: bind
+        source: /tmp
+        target: /tmp
     networks:
       - docker_caosnet
 networks:

.gitlab-ci.yml

@@ -67,6 +67,7 @@ test:
   dependencies: [cert]
   artifacts:
     paths:
+      - /tmp/crawler.output
       - caosdb_log.txt
       - mariadb_log.txt
     when: on_failure