Try whether ccache decreases test times for Cython

.github/workflows/testsuite.yml

@@ -39,18 +39,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04, windows-2022, macOS-12, macOS-14]
-        standalone: [false, true]
-        float_dtype_32: [false, true]
+        standalone: [false]
+        float_dtype_32: [false]
         python-version: ["${{ needs.get_python_versions.outputs.max-python }}"]
-        include:
-          - os: ubuntu-22.04
-            standalone: false
-            python-version: "${{ needs.get_python_versions.outputs.min-python }}"
-            float_dtype_32: false
-          - os: ubuntu-22.04
-            standalone: true
-            python-version: "${{ needs.get_python_versions.outputs.min-python }}"
-            float_dtype_32: false
 
     defaults:
       run:
@@ -75,6 +66,11 @@ jobs:
           conda install --quiet --yes pip gsl
           python -m pip install .[test] coverage
 
+      - name: ccache
+        uses: hendrikmuhs/[email protected]
+        with:
+          create-symlink: true
+
       - name: Run Tests
         run: |
           cd  $GITHUB_WORKSPACE/.. # move out of the workspace to avoid direct import