run post-render script only on project render

[cderv]

This will prevent the script to run on incremental render and preview

[github-actions]

🚀 Deployed on https://deploy-preview-1612.quarto.org

[cderv]

@cwickham This is assuming we want to render the post-render script only for quarto render.

If we want also for preview or incremental render, then current behavior is ok.

[cwickham]

@cderv Yes, this seems like a good idea. We only really need to run that script on CI.

[github-actions]

Successfully created backport PR for prerelease:

• [Sync to prerelease] run post-render script only on project render #1616