chore(ci): use cache to accelerate ci (#1004)

* chore(ci): use cache to accelerate ci

* chore: comment

.github/workflows/build.yml

@@ -35,6 +35,10 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: '14.17.0'
+      # cache
+      - uses: c-hive/gha-yarn-cache@v2
+        with:
+          directory: ./web
       - run: yarn install && CI=false yarn run build
         working-directory: ./web