Add build step to bundlewatch workflow

.github/workflows/bundlewatch.yml

@@ -44,6 +44,9 @@ jobs:
       - name: Install pnpm dependencies
         run: pnpm install --no-frozen-lockfile
 
+      - name: Build
+        run: pnpm run build
+
       - name: Run bundlewatch
         run: pnpm run bundlewatch
         env: