Allow cancel-in-progress (#1606)

Author: franciszekjob

.github/workflows/checks.yml

@@ -14,6 +14,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
 
   # ---------------------------------------------------------- #