Problems building app for linux

[rolandgeider]

This just happened in the release action (I haven't tried this on a local machine yet), it seems it's not possible to build the app for linux:

Building Linux application...
/home/runner/work/flutter/flutter/linux/flutter/ephemeral/.plugin_symlinks/rive_common/macos/SheenBidi/Source/SBParagraph.c:618:16: error: unused variable 'stringLength' [-Werror,-Wunused-variable]
Build process failed

https://github.com/wger-project/flutter/actions/runs/9052280531/job/24869782253

It might be a bug in rive, or something else. Till this is fixed, the parts in the yml file have been commented

[rolandgeider]

rive-app/rive-flutter#390

[Dieterbe]

looks like we only use Rive to show the animated logo, i'm also a bit surprised this uses a custom file format (.riv), which i don't seem to be able to open in my image editor.
perhaps we can do this simpler, and just use flutter's builtin image support to show an animated gif? e.g. as shown in https://stackoverflow.com/questions/51556356/how-to-display-animated-gif-in-flutter

[rolandgeider]

The animation format can do much more than a gif, and it's also vector graphics, which is also nice. I managed to temporarily fix this by going back to a slightly older version

[Dieterbe]

any time i do anything in the flutter codebase, it always automatically adds these changes: #586