Add concurrency settings to CI workflow for better job management

Author: bhimrazy

.github/workflows/ci-testing.yml

@@ -1,5 +1,9 @@
 name: CI testing
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 on:
   push:
     branches: [main, "release/*"]