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Gatsby のサイトを GitHub Actions で GitHub Pages にデプロイ

Last updated at Posted at 2019-09-15

Gatsby.js で構築しているブログ・サイトの GitHub Pages へのデプロイを GitHub Actions を利用して自動化する話です。

Gatsby のプロジェクトを用意

この記事では gatsbyjs/gatsby-starter-blog: Gatsby starter for creating a blog を例として用います。

GitHub Actions の設定

最新の情報は Action のリポジトリにて確認してください。

Workflow の追加

以下のワークフローを作って main ブランチへ Push すると自動的にサイトのビルドとデプロイが始まります。

.github/workflows/gh-pages.yml
name: GitHub Pages

on:
  push:
    branches:
      - main
  pull_request:

jobs:
  deploy:
    runs-on: ubuntu-20.04
    concurrency:
      group: ${{ github.workflow }}-${{ github.ref }}
    steps:
      - uses: actions/checkout@v2

      - name: Setup Node
        uses: actions/setup-node@v2
        with:
          node-version: '14'

      - name: Cache dependencies
        uses: actions/cache@v2
        with:
          path: ~/.npm
          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-node-

      - run: npm ci
      - run: npm run format
      - run: npm run test
      - run: npm run build

      - name: Deploy
        uses: peaceiris/actions-gh-pages@v3
        if: ${{ github.ref == 'refs/heads/main' }}
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./public

Project pages

User and Organization リポジトリ (username/username.github.io) の場合は GitHub Actions の workflow を追加するだけで十分です。一方で Project pages (username/project_name 形式のリポジトリ) の場合はいくつかの修正が必要です。

サイトは https://username.github.io/project_name/ 形式の URL で公開されます。

gatsby-config.js
module.exports = {
  pathPrefix: `/project_name`
}
package.json
"scripts": {
    "build": "gatsby build --prefix-paths"
}
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