Is your feature request related to a problem? Please describe.
Currently it's requires source build to test latest docfx features that is not published to NuGet.

If Nightly CI build package is available.
It can test latest features with CI.
And it can reduce regression risks for users who use non-prerelease version.

Describe the solution you'd like
Publish pre-release version NuGet package.
That supports following target frameworks. (To reduce package size)

• Latest LTS version (.NET 8)
• Latest Preview version (.NET 9 Preview)

It's published by GitHub Actions (Daily CI build or published manually with workflow_dispatch).
And older prerelease versions should be cleanup automatically by delete-package-versions action