Add a function for checking whether a setup is being run

scripts/Windows/Scripts/Config.ps1

@@ -214,6 +214,14 @@ $null = New-Module {
         Get-Config "valhalla.software.$Name";
     }
 
+    <#
+        .SYNOPSIS
+        Checks whether the current user is the setup user.
+    #>
+    function Test-SetupUser {
+        $env:UserName -eq (Get-Config "valhalla.windows.setupUser");
+    }
+
     <#
         .SYNOPSIS
         Checks whether the active session is executed with admin rights.