ci: install CUDA compilers into the container

.gitlab/ci/docker/centos7/Dockerfile

@@ -3,3 +3,6 @@ MAINTAINER Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
 
 COPY install_deps.sh /root/install_deps.sh
 RUN sh /root/install_deps.sh
+
+COPY install_cuda.sh /root/install_cuda.sh
+RUN sh /root/install_cuda.sh

.gitlab/ci/docker/centos7/install_cuda.sh

+#!/bin/sh
+
+# Install the nvidia repository.
+yum-config-manager --add-repo https://developer.download.nvidia.com/compute/cuda/repos/rhel7/x86_64/cuda-rhel7.repo
+
+# Install CUDA toolchains.
+yum install -y \
+    cuda-compiler-11-2 cuda-cudart-devel-11-2 cuda-toolkit-11-2
+
+yum clean all