Fixed build workflow.

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
               with:
                   node-version: '14.x'
                   cache: 'yarn'
-                  cache-dependency-path: frontend/yarn.lock'
+                  cache-dependency-path: '**/yarn.lock'
 
             - name: Install dependencies
               run: yarn install