Adding custom SQL Server 2019 Docker file

This Dockefile script installs Polybase, FTS with SQL Server, and tools on SQL Server 2019

Author: VanMSFT

linux/preview/examples/mssql-polybase-fts-tools/Dockerfile

@@ -0,0 +1,16 @@
+# Base OS layer: Latest Ubuntu LTS
+FROM mcr.microsoft.com/mssql/server:2019-latest
+USER root
+# Install prerequistes since it is needed to get repo config for SQL server
+RUN apt-get update && \
+    apt-get install -y software-properties-common && \
+    rm -rf /var/lib/apt/lists/*
+RUN add-apt-repository "$(wget -qO- https://packages.microsoft.com/config/ubuntu/20.04/mssql-server-2019.list)" && \
+    apt-get install -y mssql-server-fts && \
+    apt-get install -y mssql-server-polybase
+
+EXPOSE 1433
+
+USER mssql
+
+CMD ["/opt/mssql/bin/sqlservr"]