chore: concurrency

Author: 0xcadams

.github/workflows/test-and-build.yml

@@ -9,6 +9,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   build-and-test:
     runs-on: ubuntu-latest