[CI] Skip stage health check for release branch cut (#21488)

.github/workflows/pr-test-sgl-kernel.yml

@@ -17,6 +17,10 @@ on:
         required: false
         type: string
         default: ''
+      skip_stage_health_check:
+        required: false
+        type: boolean
+        default: false
 
 # Workflow-level env is NOT inherited from the caller in reusable workflows.
 # The github context (including github.event_name) IS inherited from the caller.
@@ -24,6 +28,7 @@ env:
   SGLANG_IS_IN_CI: true
   SGLANG_CUDA_COREDUMP: "1"
   SGLANG_PR_TEST_BYPASS_MAINTENANCE_ON_MAIN: ${{ github.ref == 'refs/heads/main' && 'true' || 'false' }}
+  SKIP_STAGE_HEALTH_CHECK: ${{ inputs.skip_stage_health_check == true && 'true' || 'false' }}
 
 jobs:
   sgl-kernel-unit-test: