File _service of Package joplin-desktop

<services>
    <service name="download_url">
        <param name="protocol">https</param>
        <param name="host">github.com</param>
        <param name="path">laurent22/joplin/releases/download/v2.8.8/Joplin-2.8.8.AppImage</param>
        <param name="filename">joplin-desktop.AppImage</param>
    </service>
</services>