Remove pkg-pr-new publish step from workflow

[Copilot]

The pkg-pr-new workflow was failing with exit code 1 when the GitHub app is not installed on the repository (404 response).

Changes

• Removed the Publish pkg-pr-new preview step entirely from the workflow
• The workflow now only builds packages without attempting to publish

# Before
- name: Build
  run: pnpm run build:packages

- name: Publish pkg-pr-new preview
  continue-on-error: true
  run: npx pkg-pr-new publish "./packages/v1/*" "./packages/v2/*"

# After  
- name: Build
  run: pnpm run build:packages

This resolves the CI failure by not attempting to use the pkg-pr-new app which is not installed on the repository.

Original prompt

引用: https://github.com/chris-han/CopilotKit/actions/runs/21988130682/job/63527788312#step:8:1

2026-02-13T13:20:02.2845484Z ##[group]Run npx pkg-pr-new publish "./packages/v1/" "./packages/v2/"
2026-02-13T13:20:02.2845990Z �[36;1mnpx pkg-pr-new publish "./packages/v1/" "./packages/v2/"�[0m
2026-02-13T13:20:02.2895894Z shell: /usr/bin/bash -e {0}
2026-02-13T13:20:02.2896134Z env:
2026-02-13T13:20:02.2896366Z PNPM_HOME: /home/runner/setup-pnpm/node_modules/.bin
2026-02-13T13:20:02.2896662Z ##[endgroup]
2026-02-13T13:20:14.3971879Z npm warn exec The following package was not found and will be installed: pkg-pr-new@0.0.63
2026-02-13T13:20:17.0505250Z Check failed (404): {"url":"/check","statusCode":404,"statusMessage":"Not Found","message":"The app https://github.com/apps/pkg-pr-new is not installed on chris-han/CopilotKit.","stack":""}
2026-02-13T13:20:17.1680838Z ##[error]Process completed with exit code 1.
fix it

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[chris-han]

skip publish, just build

[Copilot]

skip publish, just build

Removed the publish step. The workflow now only builds packages. (6a20f4f)