Fix docker image uploads

This uploads docker images to registry-upload.hive.blog to work around cloudflare upload limits. This hostname is an alias for registry.hive.blog without the 100MB limit. images will still be pulled using the same image name/tag as registry.hive.blog.

Related MR in hive: hive!1368 (merged)

Note: this will also add quite a few unrelated commits to the hive submodule in order to allow the hive MR to be based on develop instead of where the current submodule points. Don't merge this unless you're comfortable with the commits in hive after 54e2d637b7d18f214eb7c3c56770e8dab851adcd