fix(ci): run build job on tags for Docker images

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -3,6 +3,8 @@ name: schemas
 on:
   push:
     branches: [main]
+    tags:
+      - 'v*'
   pull_request:
     branches: [main]
   workflow_dispatch: