Limit concurrency (#187)

* Limit concurrency

* Limit concurrency

* Remove prettier config

* Update changelog

.github/workflows/test.yml

@@ -1,4 +1,9 @@
 name: Test collection
+
+concurrency:
+  group: ${{ github.head_ref }}
+  cancel-in-progress: true
+
 on:
   push:
     branches: [main]

changelogs/fragments/187.yaml

@@ -0,0 +1,3 @@
+---
+trivial:
+  - Enable concurrency check for PRs & GHA