cache theme

Author: tkostuch

.github/workflows/test_vsf1.yml

@@ -30,7 +30,9 @@ jobs:
       - name: Get cached dependencies
         uses: actions/cache@v2
         with:
-          path: '**/node_modules'
+          path: |
+            '**/node_modules'
+            '~/src/themes/default'
           key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
 
       - name: Clone default theme