Fix publish workflow npm upgrade in Bun repo

[zenoachtig]

Summary

Revert the publish workflow's npm upgrade step back to native npm instead of using Corepack.

Why

This repository declares packageManager: bun@1.3.7. When the publish workflow enables the npm Corepack shim, npm resolution goes through Corepack inside the repo and fails with:

Unsupported package manager specification (bun@1.3.7)

That prevents the Changesets publish job from running, so merged release PRs do not actually publish packages such as @gitbook/embed.

Change

In .github/workflows/publish.yaml:
replace:

corepack enable npm
corepack install -g npm@latest

with:

npm install -g npm@latest

Bun setup remains unchanged, so the repo still uses Bun for install/build/publish orchestration. This only avoids routing npm through Corepack in a Bun-managed repo.

Validation

reproduced the Corepack failure locally with corepack npm --version
ran bun run format

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2a3e4fc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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

[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-kgv0gpvfh-gitbook.vercel.app	✅
Cloudflare	https://29e42720-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-kgv0gpvfh-gitbook.vercel.app/url/gitbook.com/docs	https://29e42720-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-kgv0gpvfh-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://29e42720-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-v2-cloudflare (Inspect)	✅ No changes detected	-	May 6, 2026, 3:27 PM
customers-v2-vercel (Inspect)	👍 Changes approved	2 changed	May 6, 2026, 3:26 PM
v2-cloudflare (Inspect)	⚠️ Changes detected (Review)	20 changed	May 6, 2026, 4:18 PM
v2-vercel (Inspect)	👍 Changes approved	10 changed	May 6, 2026, 3:33 PM