Generate Github actions for generating dedicated SDK armbian x86 image

We are recommending people to start development environment with fresh Ubuntu x86 image while we could also provide ready made Armbian Jammy image. (many people use it anyway)

• pre-loaded with latest build script

• can be made daily / weekly

• precached

It might help looking into this script:

Another way / example:

GH action should be straight and simple and should be universal - which means it can be placed to any repository.

- build image
- upload to release