fix deploy

Signed-off-by: szdytom <szdytom@qq.com>

.github/workflows/build.yml

@@ -1,10 +1,21 @@
+name: Build and Deploy PDF
+
 on:
   push:
-  pull_request:
+    branches:
+      - main
   workflow_dispatch:
 
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
 jobs:
   build:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout