Autostart not possible currently

Discover configuration has a `Core` option to autostart.

Under normal usage this works by symlinking/removing the .desktop file into `$XDG_CONFIG_HOME/.autostart/`

Naturally this will do nothing inside of flatpak, and granting specific permissions to this directory *Might* work but absolutely shouldn't be done.

So we need an answer - does flatpak have an internally accessible way to add itself to the users' desktops' autostart?

For now we simply disable this checkbox in settings if we're inside a container