fix: imgrepacker bug 解包时找不到文件路径

pack-ci.sh

@@ -179,7 +179,9 @@ unpack_and_mount_image() {
         echo "Allwinner PhoenixSute Image Format Detected.."
         is_allwinner=1
         cp "$img" "$update_img_tmp_dir/update.img"
-        imgrepacker /skip "$update_img_tmp_dir/update.img"
+        pushd "$update_img_tmp_dir"
+        imgrepacker /skip ./update.img
+        popd
         rm -f "$update_img_tmp_dir/update.img"
 
         super_file="$update_img_tmp_dir/update.img.dump/super.fex"