Image build is optimized.

.gitlab-ci.yml

@@ -31,7 +31,7 @@ before_script:
   - docker network prune -f || true
   - docker image prune -a -f || true
   - docker builder prune -f || true
-  -
+
 after_script:
   - docker system prune -a -f --volumes || true
   - docker container prune -f || true