Run tests based on labels (#10456)

.github/workflows/pr-test-pd-router.yml

@@ -13,6 +13,7 @@ on:
       - 'python/sglang/srt/disaggregation/**'
       - 'scripts/ci/ci_start_disaggregation_servers.sh'
       - 'sgl-router/**'
+    types: [synchronize, labeled]
   workflow_dispatch:
 
 concurrency:
@@ -26,8 +27,7 @@ permissions:
 
 jobs:
   test-disaggregation:
-    if: (github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request') &&
-        github.event.pull_request.draft == false
+    if: github.event_name != 'pull_request' || contains(github.event.pull_request.labels.*.name, 'run-ci')
     runs-on: [h200]
     timeout-minutes: 45