Enable CI cache

Author: Frederisk

.github/workflows/build-test.yaml

@@ -37,7 +37,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.nodejs_version }}
-          # cache: 'yarn'
+          cache: 'yarn'
 
       - name: Initialize
         shell: bash