neovim-windows-nightly
This project has a GitHub Actions workflow that builds Neovim (x64) on Windows. The code was scheduled to run nightly, as a temporary workaround for the pause in official Neovim Windows nightly builds that started at the end of November 2020.
As of Neovim PR #13650, official Neovim Windows nightly builds have resumed, and are available on the Neovim Releases page.