Flatpak packaging

[RasheedAZ]

Thank you for working on this beautiful project.

If and when you get time, can you please look into packaging Sideband as a cross-distro flatpak app, and publishing a verified listing to Flathub?

Would like to test this on postmarketOS mobile Linux phone.

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Related:
https://docs.flatpak.org/en/latest/python.html