- Allows uploading artifacts for unreleased latest version for easy
  testing.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>

- Use nested directories `arch/package` in package registry to have sane
  names for the downloaded files.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>

- Use cargo-deb to build in CI.
- While the final goal is to have package in upstream debian using
  debcargo, it is only intended for stable releases.
- So use cargo-deb for experimental releases.

Changelog: added
Signed-off-by: Ayush Singh <ayush@beagleboard.org>

- Using pattern matching in rules to reduce repetition
- Split up the Makefile

Signed-off-by: Ayush Singh <ayush@beagleboard.org>