Generate GNOME flatpak runtimes from gnome-build-meta
Currently GNOME flatpak runtimes are generated using flatpak-builder from this repo: https://git.gnome.org/browse/gnome-sdk-images/
We want all GNOME release artifacts to be built from this repo instead.
We could either start by importing Freedesktop SDK 1.6 or 1.8 binaries and building the necessary GNOME components on top of that, or we could wait for #21 (closed) and pull in the Freedesktop SDK 1.8 project using a 'junction' element.
Edited by Sam Thursfield