From a3f96689f03bbf9f822a43cc2170d03e0fcf9867 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Thu, 8 Jul 2021 15:09:34 +0100
Subject: [PATCH] workflows/tests: enable concurrency limiting.

Let's cancel in-progress builds on the same PR.
---
 .github/workflows/tests.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af9a27663b..1e389382f3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,12 +1,19 @@
 name: CI
+
 on:
   push:
     branches:
       - master
   pull_request:
+
 env:
   HOMEBREW_DEVELOPER: 1
   HOMEBREW_NO_AUTO_UPDATE: 1
+
+concurrency:
+  group: "${{ github.ref }}"
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   syntax:
     if: github.repository == 'Homebrew/brew'