setup concurrency

Author: mydea

.github/workflows/flaky-test-detector.yml

@@ -13,6 +13,12 @@ env:
     nx-Linux-${{ github.ref }}
     nx-Linux
 
+# Cancel in progress workflows on pull_requests.
+# https://docs.github.com/en/actions/using-jobs/using-concurrency#example-using-a-fallback-value
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   flaky-detector:
     runs-on: ubuntu-20.04