Update Ubuntu to 18.04 and mssql-tools

Author: fabiang

Dockerfile

@@ -1,22 +1,24 @@
-FROM ubuntu:16.04
+ARG UBUNTU_VERSION=18.04
+FROM ubuntu:$UBUNTU_VERSION
 
 MAINTAINER Fabian Grutschus "docker@lubyte.de"
 
-ENV MSSQLTOOLS_VERSION=17.1.0.1-1
-ENV PATH /opt/mssql-tools/bin:$PATH
+ARG MSSQLTOOLS_VERSION=17.4.1.1-1
+ENV PATH=/opt/mssql-tools/bin:$PATH
 
 RUN apt-get update \
-    && apt-get install -y curl apt-transport-https locales \
+    && apt-get install -y curl apt-transport-https locales gnupg2 \
     && locale-gen "en_US.UTF-8" \
+    && export `grep "VERSION_ID" /etc/os-release | sed -e 's/^VERSION_ID=\"/VERSION_ID=/' -e 's/\"$//'` \
     && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
-    && curl https://packages.microsoft.com/config/ubuntu/16.04/prod.list | tee /etc/apt/sources.list.d/msprod.list \
+    && curl https://packages.microsoft.com/config/ubuntu/$VERSION_ID/prod.list | tee /etc/apt/sources.list.d/msprod.list \
     && apt-get update \
     && ACCEPT_EULA=Y apt-get install -y mssql-tools=$MSSQLTOOLS_VERSION unixodbc-dev \
     && apt-get remove -y curl apt-transport-https \
     && rm -f /etc/apt/sources.list.d/msprod.list \
     && rm -rf /var/lib/apt/lists/*
 
-## should be set after locale was generate, overwise triggers warnings
+## should be set after locale was generated, overwise triggers warnings
 ENV LANG="en_US.UTF-8" LANGUAGE="en_US.UTF-8" LC_ALL="en_US.UTF-8"
 
 ENTRYPOINT ["sqlcmd"]