diagnostics: switch log archive from zip to tar.gz

diagnostics/collect-wsl-logs.ps1

@@ -328,8 +328,28 @@ if ($Dump)
     }
 }
 
-$logArchive = "$(Resolve-Path $folder).zip"
-Compress-Archive -Path $folder -DestinationPath $logArchive
-Remove-Item $folder -Recurse
+$logArchive = "$(Resolve-Path $folder).tar.gz"
+tar.exe -czf $logArchive $folder
+if ($LASTEXITCODE -eq 0)
+{
+    Remove-Item $folder -Recurse
+    Write-Host -ForegroundColor Green "Logs saved in: $logArchive. Please attach that file to the GitHub issue."
+}
+else
+{
+    Remove-Item $logArchive -ErrorAction Ignore
 
-Write-Host -ForegroundColor Green "Logs saved in: $logArchive. Please attach that file to the GitHub issue."
+    # Fall back to zip if tar fails (e.g. on SKUs that lack tar.exe)
+    $logArchive = "$(Resolve-Path $folder).zip"
+    try
+    {
+        Compress-Archive -Path $folder -DestinationPath $logArchive -Force
+        Remove-Item $folder -Recurse
+        Write-Host -ForegroundColor Green "Logs saved in: $logArchive. Please attach that file to the GitHub issue."
+    }
+    catch
+    {
+        Remove-Item $logArchive -ErrorAction Ignore
+        Write-Host -ForegroundColor Red "Failed to compress logs. They are available in: $(Resolve-Path $folder)"
+    }
+}