Add auto cancellation for CI jobs (#1222)

when pushing new commits to the PR, cancel the previous jobs

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

Author: NobodyXu

.github/workflows/main.yml

@@ -6,6 +6,10 @@ env:
   CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
   CC_ENABLE_DEBUG_OUTPUT: true
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Test