SqlSetup: Missing Configuration Feature/Options : SQL Server Express options

Details of the scenario you tried and the problem that is occurring

This issue is created to bring some improvements to the SqlSetup DSC Configuration. The idea is to report all the missing options in the resource to be allow the installation of all the features and to use all the options available in the SQL Server installer.

Option to add to the DSC Resource :

/ENABLERANU : Enables run-as credentials for SQL Server Express installations.
/ADDCURRENTUSERASSQLADMIN : Adds the current user to the SQL Server sysadmin fixed server role. The /ADDCURRENTUSERASSQLADMIN parameter can be used when installing Express editions or when /Role=ALLFeatures_WithDefaults is used. For more information, see /ROLE below.

The DSC configuration that is using the resource (as detailed as possible)

SqlSetup

Version of the operating system and PowerShell the target node is running

Windows Server 2012/2012R2/2016

SQL Server edition and version the target node is running

SQL Server 2012/2014/2016/2017

What SQL Server PowerShell modules, and which version, are present on the target node.

Most recent version

Version of the DSC module you're using, or write 'dev' if you're using current dev branch

Most recent version

Start by locating the SqlSetup DSC resource and its existing SQL Server installer option handling. Compare the resource's supported options with /ENABLERANU and /ADDCURRENTUSERASSQLADMIN, then verify that the requested options are exposed and used during installation.