add-binding.ps1

param(
  [string] $archive,
  [string] $binding = "*:80:"
)
$xml = [xml] (Get-Content $archive)
if ($xml.SelectSingleNode("//bindings/binding") -and !$xml.SelectSingleNode("//bindings/binding[@bindingInformation='$binding']")) {
  $xml.SelectSingleNode("//bindings").AppendChild($xml.SelectSingleNode("//bindings/binding").Clone())
  $xml.SelectSingleNode("//bindings/binding/@bindingInformation").set_InnerXML($binding)
  $xml.Save($archive)
}