From 80bdcd999f1881fd26463a6f5b5aca21600907de Mon Sep 17 00:00:00 2001
From: Matthew Parkinson <mjp41@users.noreply.github.com>
Date: Fri, 21 Mar 2025 17:58:54 +0000
Subject: [PATCH] CI: Cancel inflight checks on a new push. (#760)

---
 .github/workflows/main.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index be7558b..d0d6737 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,5 +1,11 @@
 name: snmalloc CI
 
+# The following should ensure that the workflow only runs a single set of actions
+# for each PR. But it will not apply this to pushes to the main branch.
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 # Controls when the workflow will run
 on:
   # Triggers the workflow on push or pull request events but only for the master branch