feat: auto-deploy Workers on main branch push

- Add push trigger on main branch (works with sync.yml)
- Skip deployment on original repo and forks without secrets

.github/workflows/deploy-worker.yml

@@ -1,6 +1,9 @@
 name: Deploy to Cloudflare Workers
 
 on:
+  push:
+    branches:
+      - main
   workflow_dispatch:
     inputs:
       worker_name:
@@ -28,6 +31,9 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    # 仅在 fork 仓库且配置了 Cloudflare secrets 时运行
+    # 原仓库 push 和未配置 secrets 的 fork 不会触发部署
+    if: ${{ github.repository != 'MarSeventh/CloudFlare-ImgBed' && secrets.CLOUDFLARE_API_TOKEN != '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4