Chores: create server worker

[conico974]

This PR is only there to deploy a dummy server worker at least once in every env.
#3254 Depends on this, because otherwise the wrangler versions upload would fail because the worker does not exist yet.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0c2bd79

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://71ffad51.gitbook-open.pages.dev	✅
PR	https://pr3265.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-qolu415im-gitbook.vercel.app	✅
Cloudflare	https://0ddf2f40-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://71ffad51.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-qolu415im-gitbook.vercel.app/url/gitbook.com/docs	https://0ddf2f40-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://71ffad51.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-qolu415im-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://0ddf2f40-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	👍 Changes approved	4 changed	May 26, 2025, 4:36 PM
customers-v2 (Inspect)	👍 Changes approved	79 changed	May 26, 2025, 4:38 PM
default (Inspect)	✅ No changes detected	-	May 26, 2025, 4:38 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	May 26, 2025, 4:41 PM
v2-vercel (Inspect)	✅ No changes detected	-	May 26, 2025, 4:39 PM