Build and link AppImage for stable release

[probonopd]

Right now an AppImage for Linux is produced for each commit on Travis CI and can be downloaded from a temporary transfer.sh URL that is visible toward the end of each Travis CI build log. Few people will ever find it there.

Hence, build an AppImage for the stable release and link it on the download page instead of "Source":

[rullzer]

@jospoortvliet please have a look

[probonopd]

ping @jospoortvliet, in https://help.nextcloud.com/t/linux-distribution-packages-for-the-desktop-clients-help-out/2538/75 the question was asked where to download the AppImage.

[shadeslayer]

+1 to this please.

[rugk]

Any news?

[enoch85]

This issue has been inactive for some time now.

Is this issue related to the ownCloud client, (thus not an theming isssue) please close it and report the issue here instead.
Is this issue related to this repo but solved, please close it and if possible let us know what solved the issue.
Is this issue still not solved, please let us know as well.

If I don't hear anything from the one who created this issue within 2 weeks, I will close the issue.

[probonopd]

Looks like it's coming, thanks to @rullzer:
https://rullzer.com/nextcloud-desktop-client-appimage.html