[DNM] test(warden): Trigger cancellation verification

.github/workflows/warden.yml

@@ -1,9 +1,14 @@
 name: Warden
 
+# Update the concurrency group below if this workflow adds non-PR triggers.
 on:
   pull_request:
     types: [opened, synchronize, reopened]
 
+concurrency:
+  group: ${{ github.workflow }}-pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
 jobs:
   warden:
     if: github.event.pull_request.head.repo.full_name == github.repository

warden.toml

@@ -1,3 +1,5 @@
+# Organization-wide Warden configuration.
+# Shared workflows load this file as their base configuration.
 version = 1
 
 [defaults]