Fix 'pr' workflow (apollographql#6005)

BoD · BoD · commit 52adb21b70ce · 2024-07-01T11:57:17.000+02:00
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
@@ -12,7 +12,7 @@ env:
 
 # Cancel any current or previous job from the same PR
 concurrency:
-  group: ${{ github.head_ref }}
+  group: ${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
