feat: add murl pagefile property tweak

tweaks/ImageMurl.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace RockMigrations\Tweaks;
+
+use ProcessWire\HookEvent;
+
+use function ProcessWire\wire;
+
+class ImageMurl extends Tweak
+{
+  public $description = "Adds \$pagefile->murl property";
+
+  public function ready()
+  {
+    wire()->addHookProperty("Pagefile::murl", $this, "murl");
+  }
+
+  public function murl(HookEvent $event): void
+  {
+    $file = $event->object;
+    $url = ltrim($file->url, "/");
+    $path = $this->wire->config->paths->root . $url;
+    $m = $this->rockmigrations()->filemtime($path);
+    $event->return = "/$url?m=$m";
+  }
+}