error nodejs yarn project?

[Donald Wu]

npm ERR! cipm can only install packages with an existing package-lock.json or npm-shrinkwrap.json with lockfileVersion >= 1. Run an install with npm@5 or later to generate it, then try again.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/runner/.npm/_logs/2021-01-29T12_42_28_852Z-debug.log

I think this github actions didn't read yarn.lock in project
will anyone help to make this happen?

[Donald Wu]

name: Deploy master branch

on:
  push:
    branches:
      - main

jobs:
  deploy:
    name: deploy
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [12.x]

    steps:
      - uses: actions/checkout@v2
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v1
        with:
          node-version: ${{ matrix.node-version }}
      - run: yarn

      - name: serverless deploy
        uses: serverless/github-action@master
        with:
          args: deploy
        env:
          SERVERLESS_ACCESS_KEY: ${{ secrets.SERVERLESS_ACCESS_KEY }}
          AWS_ACCESS_KEY_ID: ${{ secrets.MY_AWS_ACCESS_KEY }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.MY_AWS_SECRET_ACCESS_KEY }}

ok just figure out, I need to change to this:

- run: yarn

I think the doc/readme.md need to update to make it clear...