CI: delegate pipenv cache management to the setup-python action (#3243)

.github/workflows/docker-tests.yml

@@ -53,23 +53,12 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.x"
-
-      - name: "Install pipenv"
-        run: |
-          cd docker/test
-          python -m pip install --upgrade pipenv wheel
-
-      - name: "Cache virtualenvs"
-        id: cache-pipenv
-        uses: actions/cache@v4
-        with:
-          path: ~/.local/share/virtualenvs
-          key: ${{ runner.os }}-pipenv-${{ hashFiles('**/Pipfile.lock') }}
+          cache: 'pipenv'
 
       - name: "Install dependencies"
-        if: steps.cache-pipenv.outputs.cache-hit != 'true'
         run: |
           cd docker/test
+          python -m pip install --upgrade pipenv wheel
           pipenv install --deploy
 
       - name: "Create Docker network"