Lernaで管理しているmonorepoのパッケージをPR中でも実際のアプリケーションで動作確認したかったので、canary releaseできるようにGithub Actionsを作成したのでメモ。

name: Canary Release
on:
  issue_comment:
    types: [created]

jobs:
  canary-release:
    name: canary-release
    runs-on: ubuntu-latest
    if: |
      github.event_name == 'issue_comment' && startsWith(github.event.comment.body, '/canary-release')
    steps:
      - name: checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: '0'

      - name: setup Node
        uses: actions/setup-node@v3
        with:
          node-version: 16.x
          registry-url: 'https://npm.pkg.github.com'
          scope: '@<scope_package>'
        env:
          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Cache dependencies
        uses: actions/cache@v3
        with:
          path: ./node_modules
          key: ${{ runner.os }}-node-${{ hashFiles('**/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-node-

      - name: Install packages
        run: yarn install --frozen-lockfile

      - name: Publish
        run: yarn lerna publish --canary --preid next --dist-tag next --force-publish='*' --no-push --no-git-tag-version --yes --registry=https://npm.pkg.github.com
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/github-script@v6
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: '🎉 Canary Release. You can install canary version via `npm install package@next`'
            })

PRに /canary-releaseとコメントするとcanary releaseを公開します。

参考

monorepoでPR中のコードをnpmパッケージとしてcanary releaseするGitHub Actions
lerna/commands/publish at main · lerna/lerna