Github action to update yarn.lock (not fully tested yet)

update-yarn.yml

name: Update yarn.lock
on:
  push:
    branches:
      - main
jobs:
  yarn.lock:
    runs-on: ubuntu-latest
    steps:
      # setup
      - uses: actions/checkout@v2
      - name: Read .nvmrc
        run: echo NVMRC="$(cat .nvmrc)" >> $GITHUB_ENV
      - uses: actions/setup-node@v2
        with:
          node-version: ${{ env.NVMRC }}
      # make changes
      - name: update yarn.lock
        run: yarn install
      # commit
      - name: commit
        run: |
          # check if there are yarn.lock changes to commit
          if ! git diff --quiet yarn.lock; then
            # setup the username and email
            git config --global user.email "[email protected]"
            git config --global user.name "commany-bot"
            # Stage the file, commit and push
            git add yarn.lock
            git commit -m 'chore(yarn): updated yarn.lock'
            git push
          fi