Is there a way to sideload snaps (i.e. snaps that have not been published in the snap store) when building a custom Ubuntu Core image?
Further reading, for anyone else interested in this:
Official docs for building a custom Ubuntu Core image: https://core.docs.ubuntu.com/en/guides/build-device/image-building
Great blog from @ogra with more detail on building an ‘appliance’ image: https://ograblog.wordpress.com/2019/01/07/291/