feat: add working directory parameter

[bahmutov]

• closes Allow specifying working directory #2

For repos like

repo/
  app1/
    package-lock.json
  app2/
    yarn.json

name: main
on: [push]

jobs:
  build-and-test:
    runs-on: ubuntu-latest
    name: Build and test
    steps:
      - uses: actions/checkout@v1

      - uses: bahmutov/npm-install@v1
        with:
          working-directory: app1
      - uses: bahmutov/npm-install@v1
        with:
          working-directory: app2

      - name: App1 tests
        run: npm t
        working-directory: app1
      - name: Run app2
        run: node .
        working-directory: app2

[github-actions]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀