Produce RPM packages

Reference from https://github.com/dotnet/core-setup/tree/master/src/pkg/packaging/rpm

The goal is to have parity with Debian,
but does not publish to the feed

When run the script with rhel, it will
produce rpm file in the package step
and publish rpm to the blob storage

scripts/docker/rhel/Dockerfile

@@ -0,0 +1,27 @@
+#
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#
+
+# Dockerfile that creates a container suitable to build dotnet-cli
+FROM microsoft/dotnet-buildtools-prereqs:rhel-7-rpmpkg-c982313-20174116044113
+
+# Install from sudo main package TODO This package needs to be mirrored
+RUN yum install -y https://www.sudo.ws/sudo/dist/packages/RHEL/7/sudo-1.8.20-3.el7.x86_64.rpm \
+    && yum clean all
+
+# Setup User to match Host User, and give superuser permissions
+ARG USER_ID=0
+RUN useradd -m code_executor -u ${USER_ID} -g root
+RUN echo 'code_executor ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# With the User Change, we need to change permssions on these directories
+RUN chmod -R a+rwx /usr/local
+RUN chmod -R a+rwx /home
+RUN chown root:root /usr/bin/sudo && chmod 4755 /usr/bin/sudo
+
+# Set user to the one we just created
+USER ${USER_ID}
+
+# Set working directory
+WORKDIR /opt/code