Update concurrency settings in ci.yml

Author: austenstone

.github/workflows/ci.yml

@@ -1,13 +1,12 @@
-# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
-
 name: Node.js CI
-
 on:
   push:
     branches: [ "main" ]
   pull_request:
     branches: [ "main" ]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build: