Add bcmath for DOMjudge/domjudge#2954

Author: vmcj

Diff for: docker-gitlabci/Dockerfile

@@ -12,7 +12,8 @@ RUN apt-get update && apt-get install -y \
   libjsoncpp-dev libmagic-dev autoconf automake bats sudo debootstrap procps \
   gcc g++ default-jre-headless default-jdk-headless ghc fp-compiler libcgroup-dev \
   devscripts shellcheck nginx libboost-regex-dev composer codespell pv httpie \
-  php8.3 php8.3-cli php8.3-gd php8.3-curl php8.3-mysql php8.3-gmp php8.3-zip php8.3-xml php8.3-mbstring php8.3-fpm php8.3-intl php8.3-pcov \
+  php8.3 php8.3-cli php8.3-bcmath php8.3-gd php8.3-curl php8.3-mysql php8.3-gmp \
+  php8.3-zip php8.3-xml php8.3-mbstring php8.3-fpm php8.3-intl php8.3-pcov \
   # Submit client \
   python3-requests python3-magic \
   # Docs \