retrieve the preview ID from process.env

[vicb]

The following was causing troubles in the memory queue:

			// TODO: Drop the import - https://github.com/opennextjs/opennextjs-cloudflare/issues/361
			// @ts-ignore
			const manifest = await import("./.next/prerender-manifest.json");

[changeset-bot]

🦋 Changeset detected

Latest commit: 95c1fe8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@opennextjs/cloudflare	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@opennextjs/cloudflare@1015

commit: 95c1fe8

[james-elicx]

probably want a changeset :)

[vicb]

Thanks for the review and feedback James!