add concurrency control to cancel previous runs

New pushes will automatically cancel running workflows to save resources

Author: greweb

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [main, master]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   lint-and-type-check:
     name: Code Quality (Strict)