Cache ansible requirements

.github/workflows/ansible.yml

@@ -11,6 +11,10 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: 3.7
+      - uses: actions/cache@v1
+        with:
+          path: ~/.cache/pip
+          key: pip-${{ hashFiles('requirements.txt') }}-${{ hashFiles('dev-requirements.txt') }}
       - name: Install dependencies
         run: ./scripts/ansible/setup.sh
       - name: Run linters