chore: Add concurrency settings to CI workflow

Author: Mearman

.github/workflows/ci.yaml

@@ -6,6 +6,10 @@ on:
       - main
   workflow_dispatch:
 
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.ref }}
+
 jobs:
   build-and-test:
     if: ${{ github.repository == 'jackyzha0/quartz' }}