Preserve artisan file permissions

src/ArtisanPatcher.php

@@ -150,12 +150,21 @@ class ArtisanPatcher
     private function write(string $contents): void
     {
         $temporaryPath = $this->artisanPath.'.british-artisan.tmp';
+        $permissions = fileperms($this->artisanPath);
+
+        if ($permissions === false) {
+            throw new RuntimeException('Could not read the artisan file permissions.');
+        }
 
         try {
             if (file_put_contents($temporaryPath, $contents, LOCK_EX) === false) {
                 throw new RuntimeException('Could not write the temporary artisan file.');
             }
 
+            if (! chmod($temporaryPath, $permissions & 0777)) {
+                throw new RuntimeException('Could not preserve the artisan file permissions.');
+            }
+
             if (! rename($temporaryPath, $this->artisanPath)) {
                 throw new RuntimeException('Could not replace the artisan file.');
             }