Add shared Playground preview workflows

[fumikito]

Summary

PRに playground ラベルを付けると WordPress Playground プレビューを生成する共有ワークフロー2つを追加。

• playground-preview-build.yml: プラグインをビルドしてZIPをアーティファクトにアップロード
• playground-preview-publish.yml: ZIPを公開URLに配置し、PRにプレビューコメントを投稿

使い方（各プラグインリポジトリ側）

Build caller (14行)

name: Playground Preview - Build
on:
  pull_request:
    types: [labeled, synchronize, reopened]
permissions:
  contents: read
jobs:
  build:
    if: >
      contains(github.event.pull_request.labels.*.name, 'playground') &&
      (github.event.action != 'labeled' || github.event.label.name == 'playground')
    uses: tarosky/workflows/.github/workflows/playground-preview-build.yml@main

Publish caller (17行)

name: Playground Preview - Publish
on:
  workflow_run:
    workflows: ["Playground Preview - Build"]
    types: [completed]
permissions:
  contents: write
  pull-requests: write
jobs:
  publish:
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    uses: tarosky/workflows/.github/workflows/playground-preview-publish.yml@main

前提条件

• プラグインリポジトリに playground ラベルを作成
• ci-artifacts pre-release を作成: gh release create ci-artifacts --prerelease --title "CI Artifacts" --notes "Do not delete."

taro-lead-next で動作確認済み

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