Upgrade gitlabci container to ubuntu 22.04 (jammy)

The default for PHP changes to 8.1. The package php8.1-json is now already provided
by both php8.1-{fpm,cli} and became virtual.

The npm pa11y tool is now install globally as npm changed its working,
given that we run this in CI as either domjudge or root having it
globally is actually better.

Author: vmcj

.gitlab-ci.yml

@@ -8,7 +8,7 @@ stages:
 
 variables:
   FF_DISABLE_UMASK_FOR_DOCKER_EXECUTOR: "true" # see https://gitlab.com/gitlab-org/gitlab-runner/-/issues/1736
-  GITLABCI_VERSION:    "2.1"
+  GITLABCI_VERSION:    "22.04"
   GITLABCI_IMAGE:      "gitlabci"
   CONTRIBUTOR_IMAGE:   "domjudge/domjudge-contributor"
   DOMJUDGE_VERSION:

docker-gitlabci/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 ENV DEBIAN_FRONTEND=noninteractive
 ENV PHPSUPPORTED="7.2 7.3 8.0 8.1 8.2"
 ENV APTINSTALL="apt install -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold"
@@ -7,7 +7,7 @@ RUN apt update && apt install -y \
   libjsoncpp-dev libmagic-dev autoconf automake bats sudo debootstrap procps \
   gcc g++ default-jre-headless default-jdk ghc fp-compiler libcgroup-dev \
   devscripts shellcheck nginx libboost-regex-dev \
-  php7.4 php7.4-cli php7.4-gd php7.4-curl php7.4-mysql php7.4-json php7.4-gmp php7.4-zip php7.4-xml php7.4-mbstring php7.4-fpm php7.4-intl php7.4-pcov \
+  php8.1 php8.1-cli php8.1-gd php8.1-curl php8.1-mysql php8.1-gmp php8.1-zip php8.1-xml php8.1-mbstring php8.1-fpm php8.1-intl php8.1-pcov \
   # W3c test \
   httrack \
   # Visual regression browser \
@@ -28,7 +28,7 @@ RUN apt update && apt install -y \
   # Code coverage for unit test
   php-pear php-dev \
   # Needed NPM packages \
-  && npm install pa11y \
+  && npm install -g pa11y \
   # Needed python packages \
   && pip install codespell \
   && rm -rf /var/lib/apt/lists/*
@@ -51,7 +51,7 @@ RUN add-apt-repository ppa:ondrej/php -y && apt update && \
         for PACKAGE in $PACKAGES; do \
             $APTINSTALL php${VERSION}-${PACKAGE#php*-}; \
         done; \
-    done && update-alternatives --set php /usr/bin/php7.4
+    done && update-alternatives --set php /usr/bin/php8.1
 
 # Put the gitlab user in sudo
 RUN echo 'ALL ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers