Configure CI/CD workflow to use Bun for GitHub Pages deployment

[Copilot]

The existing workflow detected bun.lock but still used Node.js for installation and builds. This updates the pipeline to properly utilize Bun throughout.

Changes

GitHub Actions Workflow (.github/workflows/nextjs.yml):

• Replace actions/setup-node@v4 with oven-sh/setup-bun@v2 (pinned to v1.1.38)
• Remove package manager detection logic
• Update cache keys to reference only bun.lock
• Use bun install and bun run build commands directly

Next.js Configuration (next.config.js):

• Add output: 'export' for static site generation (required for GitHub Pages)

- name: Setup Bun
  uses: oven-sh/setup-bun@v2
  with:
    bun-version: "1.1.38"
    
- name: Install dependencies
  run: bun install
  
- name: Build with Next.js
  run: bun run build

Original prompt

write a CI/CD for bun to deploy to github pages

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