Add concurrency groups to cancel in-progress CI runs on new pushes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CARGO_TERM_COLOR: always
 

.github/workflows/publish.yml

@@ -5,6 +5,10 @@ on:
     tags:
       - 'v*'
 
+concurrency:
+  group: publish-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CARGO_TERM_COLOR: always