ci: cancel github action on branch update

Author: 9romise

.github/workflows/unit-test.yml

@@ -8,6 +8,11 @@ on:
     branches:
       - main
 
+# cancel in-progress runs on new commits to same PR (gitub.event.number)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   unit-test:
     uses: sxzz/workflows/.github/workflows/unit-test.yml@v1