ci: add cuda9.2 base image

.gitlab/ci/docker/cuda9.2/Dockerfile

+FROM nvidia/cuda:9.2-devel-ubuntu16.04
+MAINTAINER Brad King <brad.king@kitware.com>
+
+COPY install_deps.sh /root/install_deps.sh
+RUN sh /root/install_deps.sh

.gitlab/ci/docker/cuda9.2/install_deps.sh

+#!/bin/sh
+
+set -e
+
+apt-get update
+
+# Install development tools.
+apt-get install -y \
+    g++ \
+    clang-3.8 \
+    curl \
+    git
+
+apt-get clean