Add SQL Server 2017 with RHEL 8 example

Author: VanMSFT

linux/preview/examples/mssql-rhel8-sql2017/Dockerfile

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+# SQL Server 2017 on RHEL 8 ubi Sample
+# This is a sample script shared to help create the SQL Server 2017 containers images based on RHEL 8
+# This script can be modified to add other SQL Server components like polybase, Full text search, and others.
+# Base OS layer: latest RHEL 8 ubi image
+FROM registry.access.redhat.com/ubi8:latest
+
+# You need to ensure that the host where you are building this image has repos subscribed that are required to install the package dependencies, like python3, bzip2, and many more.
+# Adding repositories and installing SQL Server and tools packages
+RUN REPOLIST=rhel-8-for-x86_64-baseos-rpms,rhel-8-for-x86_64-appstream-rpms,packages-microsoft-com-mssql-server-2017,packages-microsoft-com-prod && \
+    curl -o /etc/yum.repos.d/mssql-server.repo https://packages.microsoft.com/config/rhel/8/mssql-server-2017.repo && \
+    curl -o /etc/yum.repos.d/msprod.repo https://packages.microsoft.com/config/rhel/8/prod.repo && \
+    ACCEPT_EULA=Y yum -y install --disablerepo "*" --enablerepo ${REPOLIST} --setopt=tsflags=nodocs \
+      mssql-server mssql-tools unixODBC-devel && \
+    yum clean all
+
+## Adding the required non-root mssql user and also giving access to the mssql server folders
+RUN useradd -M -s /bin/bash -u 10001 -g 0 mssql
+RUN mkdir -p -m 770 /var/opt/mssql && chown -R mssql. /var/opt/mssql
+
+## Containers not to be run as root, so accessing it as mssql user.
+USER mssql
+
+# Default SQL Server TCP/Port
+EXPOSE 1433
+
+# Run SQL Server binary
+CMD ["/opt/mssql/bin/sqlservr"]