Add docker-based tests for package installation workflows

Signed-off-by: Evan Lezar <elezar@nvidia.com>

test/release/docker/centos8/Dockerfile

@@ -0,0 +1,35 @@
+FROM centos:8
+
+RUN yum install -y \
+    yum-utils \
+    ruby-devel \
+    gcc \
+    make \
+    rpm-build \
+    rubygems \
+    createrepo
+
+RUN gem install --no-document fpm
+
+# We create and install a dummy docker package since these dependencies are out of
+# scope for the tests performed here.
+RUN fpm -s empty \
+    -t rpm \
+    --description "A dummy package for docker-ce_18.06.3.ce-3.el7" \
+    -n docker-ce --version 18.06.3.ce-3.el7 \
+    -p /tmp/docker.rpm \
+    && \
+    yum localinstall -y /tmp/docker.rpm \
+    && \
+    rm -f /tmp/docker.rpm
+
+
+ARG WORKFLOW=nvidia-docker
+ARG TEST_REPO=nvidia.github.io
+ENV TEST_REPO ${TEST_REPO}
+RUN curl -s -L https://nvidia.github.io/${WORKFLOW}/centos8/nvidia-docker.repo \
+    | tee /etc/yum.repos.d/nvidia-docker.repo
+
+COPY entrypoint.sh /
+
+ENTRYPOINT [ "/entrypoint.sh" ]