Package as Flatpak for elementary OS 6

[danirabbit]

As you might have heard, AppCenter is going Flatpak! For elementary OS 6, we will not longer be accepting Debian packaging, so your app will need to be updated.

We have documentation on our developer guide for writing your Flatpak manifest here: https://docs.elementary.io/develop/writing-apps/our-first-app/packaging#flatpak-manifest

Also, in case you missed it, elementary OS 6 beta 2 is now available. This is a great time to get your app packaged up as Flatpak and test that everything is working before the final release. AppCenter submission for OS 6 will be open soon, so don't delay :)

[unbelievableflavour]

Sorry, I wont be updating the application for Elementary OS 6 since I don't use Elementary OS anymore. If anyone is willing to take over the project then I'll be happy to explain everything I can to make the migration go smoothly.

[greenmanspirit]

I would be willing to make the flatpak changes or take over the project. I like this app and don't want to see it go away with Odin.

[greenmanspirit]

So I have the app built and running on the beta. Everything appears to be working as expected with the exception of the dark theme. The background color of the listbox is different form the background color of the list items.

As for flatpak progress. It appears that vte-2.91 is not available in the io.elementary.Platform runtime so that flatpak doesn't build. I need to figure out the best way to add it.