Add support using pnpm

[zjffun]

Pre-requisites

• Prior to submitting a new workflow, please apply to join the GitHub Technology Partner Program: partner.github.com/apply.

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Please note that at this time we are only accepting new starter workflows for Code Scanning. Updates to existing starter workflows are fine.

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Tasks

Some general notes:

• This workflow must only use actions that are produced by GitHub, in the actions organization, or
• This workflow must only use actions that are produced by the language or ecosystem that the workflow supports. These actions must be published to the GitHub Marketplace. We require that these actions be referenced using the full 40 character hash of the action's commit instead of a tag. Additionally, workflows must include the following comment at the top of the workflow file:

  # This workflow uses actions that are not certified by GitHub.
  # They are provided by a third-party and are governed by
  # separate terms of service, privacy policy, and support
  # documentation.
  

• Automation and CI workflows should not send data to any 3rd party service except for the purposes of installing dependencies.
• Automation and CI workflows cannot be dependent on a paid service or product.

[zjffun]

TODO: Find why Build with Next.js error:

Failed to compile.

To use Next.js' built-in Sass support, you first need to install `sass`.
Run `npm i sass` or `yarn add sass` inside your workspace.

Example: https://github.com/zjffun/blog/actions/runs/10219916918/job/28279183572