fix: update deployment workflow concurrency settings

Configure concurrency group for website deployment workflow to prevent race conditions and ensure orderly deployment execution. The cancel-in-progress setting is set to false to maintain deployment stability.

.gitea/workflows/deploy.yaml

@@ -1,6 +1,8 @@
 ---
 name: Deploy website on production server when committing on main
-concurrency: 1
+concurrency:
+  group: deploy-website
+  cancel-in-progress: false
 
 on:
   push: