Make an official Flatpak on Flathub

(#948) Feature Shipped packaging

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Comment by @spectrapulse
RexSystem 1 vote edited originally by @spectrapulse on GitHub
@spectrapulse You can't use prebuilt deb's and rpm's on immutable distros.
I'm not sure about Debian based distro's but I know Fedora based images usually come with rpm-ostree which does work with rpm's.