Python GitHub Actions with pip cache

ci.yml

    steps:
    - uses: actions/checkout@v2

    - name: Setup Python
      uses: actions/setup-python@v1
      with:
        python-version: 3.7

    - uses: actions/cache@v2
      with:
        path: ~/.cache/pip
        key: ${{ hashFiles('setup.py') }}-${{ hashFiles('dev-requirements.txt') }}
        
    - name: Install requirements
      run: |
        pip install --upgrade --upgrade-strategy eager -r dev-requirements.txt -e .