ci: set concurrency and trigger ci on master (#2701)

.github/workflows/ci.yml

@@ -2,8 +2,14 @@ name: CI
 
 on:
   pull_request:
+  push:
+    branches: [master]
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref_name }}
+  cancel-in-progress: true
+
 permissions:
   contents: read