add deploy workflow for automatic deployment on push to master

.gitea/workflows/deploy.yml

@@ -0,0 +1,19 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Deploy
+        run: |
+          rm -rf /var/www/chengyu/*                                                                                                                                                                              
+          mkdir -p /var/www/chengyu
+          cp -r * /var/www/chengyu/