Merge pull request NixOS#14385 from lovesegfault/ci-concurrency-group

ci: cancel previous workflow runs on PR updates

Author: Ericson2314

.github/workflows/ci.yml

@@ -14,6 +14,10 @@ on:
         default: true
         type: boolean
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions: read-all
 
 jobs: