プライベート npm パッケージを .npmrc で指定しているときの GitHub Actions のやり方

@example-team:registry=https://npm.pkg.github.com/example-repo
//npm.pkg.github.com/:_authToken=ghp_abcdefghijklmnopqrstuvwxyz0123456789

jobs:
  ESLint:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-node@v2
        with:
          node-version: 16
          cache: 'npm'
      - run: echo "@example-team:registry=https://npm.pkg.github.com/example-repo" >> .npmrc
      - run: echo "//npm.pkg.github.com/:_authToken=${{ secrets.ACCESS_TOKEN }}" >> .npmrc
      - run: npm ci
      # 以降処理が続く

echo "@example-team:registry=https://npm.pkg.github.com/example-repo" >> .npmrc
echo "//npm.pkg.github.com/:_authToken=${{ secrets.ACCESS_TOKEN }}" >> .npmrc

${{ secrets.ACCESS_TOKEN }}