feat: docker system prune at cleanup

.gitlab-ci.yml

@@ -602,4 +602,6 @@ cleanup:
       if [ "$CI_PIPELINE_SOURCE" == "merge_request_event" ]; then
         ./gitlab-ci/cleanup_registry.sh -i jug_xl -r 69 ${NIGHTLY_TAG}
       fi
-
+    - docker system prune --force
+    - docker system df
+    - docker images