Create a PPA

[w0rp]

I'm not sure if there is one already, but it would be great to have a PPA for Standard Notes on Linux so users can receive updates for the desktop app on Debian or Ubuntu based machines through apt. It's my preferred way to install software. I use this PPA for installing Signal on KDE Neon, for example: https://www.ubuntuupdates.org/ppa/signal