Update pythonpackage.yml

.github/workflows/pythonpackage.yml

@@ -24,18 +24,28 @@ jobs:
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
 
     steps:
+
     - uses: actions/checkout@v1
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+
+    - uses: actions/cache@v2
+      with:
+        path: ${{ env.pythonLocation }}
+        key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('requirements.txt') }}-${{ hashFiles('requirements-test.txt') }}
+
     - name: Install psycopg2 prerequisites
       run: sudo apt-get install libpq-dev
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt
         pip install -r requirements-test.txt
         pip install tox tox-gh-actions
+
     - name: Test with tox
       run: tox