Try with tarball

Author: vmcj

.github/workflows/build-gitlab-container-PR.yml

@@ -60,6 +60,7 @@ jobs:
             cd misc-tools
               make dj_make_chroot
               sudo ./dj_make_chroot
+              sudo tar cf "$(pwd)/chroot" chroot.tar
 
       - run: |
           sudo find . -name chroot

docker-gitlabci/Dockerfile

@@ -64,4 +64,4 @@ RUN wget $GITHUBDICTIONARY -O $CODESPELLDICTLOCATION
 RUN mkdir -p /run/php \
  && rm /etc/php/*/fpm/pool.d/www.conf
 
-COPY ["domjudge-main/chroot", "/"]
+COPY ["domjudge-main/chroot.tar", "/"]