github-ci: cancel previous builds workflow for branch

On a push of the same branch, cancel the previous running builds.yml
workflow.

Author: jasonish

.github/workflows/builds.yml

@@ -12,6 +12,10 @@ on:
       SV_REPO:
       SV_BRANCH:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions: read-all
 
 env: