Flatpak support

[Lenni-builder]

Tell us about your feature idea

It would be nice if you could build Flatpaks that can be published in stores like Flathub with PWABuilder.

Do you have an implementation or a solution in mind?

This could possibly be done in the form of a simple GTK app with a WebKitGTK webview or alternatively by building an Electron app using an approach similar to Nativefyer, possible even taking some code from it.
Most code could probably be shared with Snap packaging (see #1605).

Have you considered any alternatives?

Just making generic Linux builds would also be possible, but that would need more work by the app's creator to publish it. Having standalone packages as an additonal option would be nice though.

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