CI: add cache

Author: azu

.github/workflows/test.yml

@@ -16,6 +16,7 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node_version }}
+          cache: "yarn"
       - name: Install
         run: yarn install
       - name: Build

.github/workflows/website.yml

@@ -14,6 +14,7 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: 18
+          cache: "yarn"
       - name: Set Env
         run: |
           echo "OWNER_NAME=$(echo "$GITHUB_REPOSITORY" | awk -F / '{print $1}')" >> $GITHUB_ENV