docs: document RenderOptions.waitUntil

[gllmt]

Description

Documents the new RenderOptions.waitUntil() option added by withastro/astro#16187.

This explains how adapter authors can forward a runtime waitUntil() hook to app.render() so runtime cache providers can schedule background work without blocking the response.

Related issues & labels

• Related: fix(cloudflare): pass waitUntil to cache providers astro#16187
• Suggested label: merge-on-release

For Astro version: 6.2.0. See astro PR withastro/astro#16187.

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[gllmt]

Companion docs PR for withastro/astro#16187. Since this documents a new public option that is not released yet, this should likely follow the usual merge-on-release docs flow.

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[ArmandPhilippot]

Thanks for the fix and the docs! I left a few suggestions, especially around the code snippet, as I'm not sure if it's currently useful.

And, please use our PR template the next time.

[gllmt]

Thanks for the suggestions, that makes sense.

I’ve applied the updates:

• aligned the docs style for RenderOptions.waitUntil()
• replaced the snippet with a concrete adapter server entrypoint example
• updated the intro to reference both waitUntil() and the adapter entrypoint docs
• updated the PR body to follow the docs template

pnpm check passes.

[yanthomasdev]

LGTM!

[ArmandPhilippot]

Thanks for the updates, LGTM too!