CI: Switch to Makefile

- Not using cross in CI because docker in docker is a pain. Also cross
  images a bit too old right now, so stick to more manual approach.
- Add CI for the following stuff
  - Windows
    - cli
      - x86_64 exe
    - gui
      - x86_64 exe
  - Linux
    - cli
      - x86_64 executable
      - aarch64 executable
      - arm64 executable
    - gui
      - appimage
	- x86_64
	- aarch64
	- arm64

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