Switch packages for Ubuntu & macOS to use tar.gz format instead of zip (#6)

Switch to using tar.gz format for Ubuntu and macOS systems because it is much more common on nix systems which is important in container scenarios

helpers/win-helpers.psm1

@@ -2,7 +2,7 @@
 .SYNOPSIS
 Unpack *.7z file
 #>
-function Extract-7ZipArchive {
+function Extract-SevenZipArchive {
     param(
         [Parameter(Mandatory=$true)]
         [String]$ArchivePath,
@@ -12,4 +12,23 @@ function Extract-7ZipArchive {
 
     Write-Debug "Extract $ArchivePath to $OutputDirectory"
     7z x $ArchivePath -o"$OutputDirectory" -y | Out-Null
+}
+
+function Create-SevenZipArchive {
+    param(
+        [Parameter(Mandatory=$true)]
+        [String]$SourceFolder,
+        [Parameter(Mandatory=$true)]
+        [String]$ArchivePath,
+        [String]$ArchiveType = "zip",
+        [String]$CompressionLevel = 5
+    )
+
+    $ArchiveTypeArgument = "-t${ArchiveType}"
+    $CompressionLevelArgument = "-mx=${CompressionLevel}"
+    
+    Push-Location $SourceFolder
+    Write-Debug "7z a $ArchiveTypeArgument $CompressionLevelArgument $ArchivePath @$SourceFolder"
+    7z a $ArchiveTypeArgument $CompressionLevelArgument $ArchivePath $SourceFolder\*
+    Pop-Location
 }