Automatic update for Appimage on Linux

[Thatoo]

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Expected behaviour

Client should automatically update to newer version when one is available. When there is a new update, it should offers us to click once and auto-update as explain in Appimage doc (https://docs.appimage.org/packaging-guide/optional/updates.html#making-appimages-self-updateable). We should not need to download the appimage, replace the old by the new appimage file and then have to set a new launch on startup (as it is considered by the system as new app instead of an update of app). After successful update, he might say “the update was installed” and done....

Actual behaviour

Tell us what happens instead
We are invited to download the new appimage of the new version. Wee should do the job to remove the old appimage file from our system and set the new appimage file to launch on startup... It's a lot of work for simply updating.

Steps to reproduce

Client configuration

Client version: 3.0.3

Operating system:

OS language: Debian buster 10

Qt version used by client package (Linux only, see also Settings dialog): 5.11.3

Client package (From Nextcloud or distro) (Linux only): Appimage

Installation path of client: /home/xxxx/applications/