Store AUR build scripts inside spaceship-prompt organization

[sandboiii]

The problem

We had a discussion about possibility of keeping AUR build scripts inside spaceship-prompt organization #1312 (comment)

Describe the solution you'd like

The considered solution is to create a repo in which github action would mirror commits to AUR repo. I have access to both spaceship-prompt and spaceship-prompt-git packages. So, we probably need to have two separate repos with configured CI

Describe alternatives you've considered

No response

Documentation and adoption

No response