AppImage update information missing

[vv01f]

I would like the Image to contain information where to check for updates to retrieve them automagically according to the standard of the already provided AppImage format.

• AppImage works fine (tested on Debian and NixOS)
• Update information in the App itself is wrong, version 4.47.1 does not inform about the newer version
• Update is manual although the format would allow for easier automation, from external with e.g. AppImageUpdate or even by the App itself.

I checked with (cli for the mentioned AppImageUpdate) appimageupdatetool --describe ./BitBox-4.47.1-x86_64.AppImage (knowing 4.47.2 is available):

Parsing file: ~/Downloads/BitBox-4.47.1-x86_64.AppImage
AppImage type: 2
Raw update information: <empty>
Update information invalid: | not found
Failed to parse AppImage. See above for more information

Proposed fix: provide meta information for the AppImage to enable finding updates.

Related docs for the necessary update information:

• https://docs.appimage.org/packaging-guide/optional/updates.html
• https://github.com/AppImage/AppImageSpec/blob/master/draft.md#github-releases