github actions: Cancel once of the workflow

Either the push or pull_request is cancelled.

Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

Author: roxanan1996

.github/workflows/kernel-build-and-test-multiarch-trigger.yml

@@ -9,6 +9,10 @@ on:
       - '**'
       - '!mainline'
 
+concurrency:
+  group: kernel-ci-${{ github.event.pull_request.head.ref || github.ref_name }}
+  cancel-in-progress: true
+
 jobs:
   kernelCI:
     uses: ctrliq/kernel-src-tree/.github/workflows/kernel-build-and-test-multiarch-trigger.yml@rnicolescu_test