ci(deploy): cancel superseded deploys on new push

Queued deploy runs were deploying origin/main at start anyway (preflight reset), so waiting runs duplicated the newest deploy instead of their own commit. Cancel them.

.gitea/workflows/deploy.yaml

@@ -8,7 +8,7 @@ on:
 
 concurrency:
   group: deploy-main
-  cancel-in-progress: false
+  cancel-in-progress: true
 
 env:
   DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}