Upload Core Desktop model to the store

Ubuntu Core uploads its model directly to the store, allowing the ISO build pipeline to just download it during building. It is done here:

https://git.launchpad.net/livecd-rootfs/tree/live-build/ubuntu-core-installer/hooks/05-prepare-image.binary#n34

How can we, the Ubuntu Core Desktop, upload our model to be able to do the same?

Thanks.

@store Is this something you can help with?

Ping @store - can you please advise how to proceed with this request?