There's a closed pull request on the void-packages repository

New package: rot8
https://github.com/void-linux/void-packages/pull/24425

Description:
`rot8` is a screen rotation daemon that works with Sway and X11.

[GitHub repo](https://github.com/efernau/rot8)

Sway itself [suggests using rot8](https://github.com/swaywm/sway/wiki#display-rotation) for automatic display rotation.