MNT: Adding another change.

.github/workflows/ci.yml

@@ -51,6 +51,7 @@ jobs:
           create-args: python=${{ matrix.python-version }}
           environment-file: continuous_integration/environment_actions.yml
           environment-name: act_env
+          cache-downloads: true
 
       - name: Install ACT
         shell: bash -l {0}