title: How to run tox from github actions
body: <p>I am new to tox and GitHub actions, and I am looking for a simple way to make them work together. I wrote this <a href="https://github.com/erelsgl/fairpy/blob/master/.github/workflows/pythonpackage.yml" rel="noreferrer">simple workflow</a>:</p>
  
  <pre><code>name: Python package
  
  on: [push]
  
  jobs:
    build:
  
      runs-on: ubuntu-latest
      strategy:
        max-parallel: 4
        matrix:
          python-version: [3.7]
  
      steps:
      - uses: actions/checkout@v1
      - name: Install tox
        run: pip install tox
      - name: Run tox
        run: tox
  </code></pre>
  
  <p>which just installs tox and then runs it. But when I <a href="https://github.com/erelsgl/fairpy/runs/367865577" rel="noreferrer">run this workflow</a>, the tox installation works fine, but the run command returns an error:</p>
  
  <pre><code>tox: command not found
  </code></pre>
  
  <p>What is the correct way to run tox from a GitHub action?</p>