Revert "Remove yarn"

This reverts commit 602c1ed9a6.

.github/workflows/build.yaml

@@ -21,10 +21,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-          cache: "npm"
+          cache: "yarn"
 
       - name: Install dependencies
-        run: npm install
+        run: yarn install --frozen-lockfile
 
       - name: Build
-        run: npm build:production
+        run: yarn build:production