Alfred Agrell (@Alcaro) commented about tools/gitlab/image-amd64.docker:
libxcursor-dev:amd64 libxcursor-dev:i386 \libxext-dev:amd64 libxext-dev:i386 \libxi-dev:amd64 libxi-dev:i386 \libxinerama-dev:amd64 libxinerama-dev:i386 \libxkbcommon-dev:amd64 libxkbcommon-dev:i386 \libxkbregistry-dev:amd64 libxkbregistry-dev:i386 \libxrandr-dev:amd64 libxrandr-dev:i386 \libxrender-dev:amd64 libxrender-dev:i386 \libxxf86vm-dev:amd64 libxxf86vm-dev:i386 \linux-libc-dev:amd64 linux-libc-dev:i386 \lld \llvm \mesa-vulkan-drivers:amd64 mesa-vulkan-drivers:i386 \netbase \ocl-icd-opencl-dev:amd64 ocl-icd-opencl-dev:i386 \perl \
I'm pretty sure Perl is installed on every Debian.
But being explicit about dependencies always helps. Let's keep it.