Cache the chroot in the GitLab CI image

This makes the integration test a bit faster:
- Expected to be slower in downloading the CI docker image
- Faster in not having to build the chroot

Building within the Dockerfile is difficult as we need privileged to chroot, this is non easy
so we build outside and copy the result in, this also saves us in the cache of the apt packages.

Author: vmcj

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

@@ -48,6 +48,9 @@ jobs:
         with:
           images: ghcr.io/${{ github.repository }}
 
+      - name: Building an example chroot
+        run: docker-gitlabci/build_ci_chroot.sh
+
       - name: Build and push Docker images
         uses: docker/build-push-action@v5
         with:

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

@@ -35,6 +35,9 @@ jobs:
         with:
           images: domjudge/gitlabci
 
+      - name: Building an example chroot
+        run: docker-gitlabci/build_ci_chroot.sh
+
       - name: Build and push Docker images
         uses: docker/build-push-action@v5
         with:

docker-gitlabci/Dockerfile

@@ -63,3 +63,5 @@ RUN wget $GITHUBDICTIONARY -O $CODESPELLDICTLOCATION
 # Do some extra setup
 RUN mkdir -p /run/php \
  && rm /etc/php/*/fpm/pool.d/www.conf
+
+ADD ["domjudge-main/chroot.tar", "/"]

docker-gitlabci/build_ci_chroot.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+sudo apt install acl composer debootstrap g++ gcc libcgroup-dev lsof make \
+                 mariadb-server nginx ntp php php-bcmath php-cli php-curl \
+                 php-fpm php-gd php-intl php-json php-mbstring php-mysql \
+                 php-xml php-zip pkg-config procps pv python3-yaml sudo unzip zip
+
+cd docker-gitlabci || exit 1
+  wget https://github.com/DOMjudge/domjudge/archive/refs/heads/main.zip
+  unzip main.zip
+  cd domjudge-main || exit 1
+    chroot_path="$(pwd)/chroot"
+    make configure
+    ./configure --with-domjudge-user=domjudge --with-judgehost_chrootdir="${chroot_path}"
+  cd misc-tools || exit 1
+    make dj_make_chroot
+    sudo ./dj_make_chroot
+    sudo tar -cvf "${chroot_path}.tar" "${chroot_path}"