Describe the requested feature:
Building bunqDesktop as a Flatpak would make it easier for users to install and use bunqDesktop. Publishing this build to, for example, Flathub, most Flatpak user's repo of choice for installing apps, would lend bunqDesktop also more exposure. Lastly, Flatpaks happen to be sandboxed, which makes running the app is generally safer, which is a rather important for a banking app.

Additional context:
Flatpak website: https://flatpak.org
Flathub website: https://flathub.org