Defaulting trustHost to true if we detect we are in a Cloudflare Workers runtime

[NickCrews]

Goals

I deployed an app to cloudflare pages and ran into #8327. The short answer was for me to manually set trustHost to true. But if I look at

next-auth/packages/core/src/lib/utils/env.ts

Lines 44 to 50 in 3664aa5

	config.trustHost ??= !!(
	envObject.AUTH_URL ??
	envObject.AUTH_TRUST_HOST ??
	envObject.VERCEL ??
	envObject.CF_PAGES ??
	envObject.NODE_ENV !== "production"
	)

, then it looks like we autoconfigure this for certain cloud hosting providers, such as vercel or cloudflare pages. But cloudflare workers isn't one of them. I propose we add cloudflare workers to this shortlist

Non-Goals

No response

Background

See the linked issues. The alternative is for the user to manually set trustHost in the JS side, or to set AUTH_TRUST_HOST as an env var

Proposal

Add the relevant test to the linked code. I did some google searching to try to find what env var we could look for to use as a signal that we are running in a CF workers runtime, but I had no success. If someone points me in the right direction I will submit a PR.