build: update workflow file

Author: ph1p

.github/workflows/vercel-deploy.yml

@@ -28,8 +28,9 @@ jobs:
     needs: test
     steps:
       - name: build
-      - run: npm i
-      - run: npm run build
+        run: |
+          npm i
+          npm run build
 
       - name: build example
         working-directory: ./example