clone dataLayer event for matomo tag manager _mtm variable.js

<script>
/*
Put this in a Matomo Tag Manager Container in order to copy each fresh event from the dataLayer to Matomo.
*/
window.dataLayer = window.dataLayer || [];
window._mtm = window._mtm || [];
var originalPush = dataLayer.push;
dataLayer.push = function() {
  var args = Array.prototype.slice.call(arguments);
  originalPush.apply(dataLayer, args);
  var latestChange = args[args.length - 1];
  window._mtm.push(latestChange);
};
</script>