Add a function for selecting the profile

scripts/Common/Scripts/Config.ps1

@@ -1,4 +1,5 @@
 using namespace Microsoft.Win32;
+using namespace System.Management.Automation.Host;
 using namespace System.Security.AccessControl;
 using namespace System.Security.Principal;
 
@@ -32,6 +33,54 @@ $null = New-Module {
     [string] $finishedOption = "Finished";
     [RegistryKey] $key = $null;
 
+    <#
+        .SYNOPSIS
+        Prompts the user to select a profile to act on.
+    #>
+    function Show-ProfileNamePrompt {
+        . "$PSScriptRoot/../../Windows/Types/WindowsInstallerAction.ps1";
+
+        $profiles = & {
+            . "$PSScriptRoot/SoftwareManagement.ps1";
+            
+            if (Test-Command "wsl") {
+                return Invoke-ConfigScript "getProfiles";
+            } else {
+                return Get-ChildItem "$PSScriptRoot/../../../.config" | ForEach-Object { Split-Path -LeafBase $_ };
+            }
+        };
+
+        $choice = $Host.UI.PromptForChoice(
+            "Select Profile",
+            (& {
+                switch (Get-Stage) {
+                    ([WindowsInstallerAction]::Backup) {
+                        "Which profile do you wish to back up?";
+                    }
+                    ([WindowsInstallerAction]::Install) {
+                        "Which profile do you wish to install?";
+                    }
+                    $null {
+                        "Which profile do you wish to set up?";
+                    }
+                }
+            }),
+            (& {
+                for ($i = 0; $i -lt $profiles.Count; $i++) {
+                    [ChoiceDescription]"&$i - $($profiles[$i])";
+                }
+
+                [ChoiceDescription]"&Abort";
+            }),
+            $profiles.Count);
+
+        if ($choice -eq $profiles.Count) {
+            exit;
+        } else {
+            $env:CONFIG_NAME = $profiles[$choice];
+        }
+    }
+
     <#
         .SYNOPSIS
         Converts the specified path to linux and escapes it for the use in a script.