Add concurrency rule to ci workflow

Author: jkeen

.github/workflows/release.yml

@@ -4,6 +4,10 @@
   on:
     workflow_dispatch:
 
+  concurrency:
+    group: ci-${{ github.head_ref || github.ref }}
+    cancel-in-progress: true
+
   jobs:
     release:
       name: Release