README: model workflow: add concurrency group

Co-authored-by: Andreas Abel <[email protected]>

Author: sestrella

README.md

@@ -110,8 +110,12 @@ on:
   pull_request:
     branches: [main, master]
 
-permissions:
-  contents: read
+# INFO: The following configuration block ensures that only one build runs per branch,
+# which may be desirable for projects with a costly build process.
+# Remove this block from the CI workflow to let each CI job run to completion.
+concurrency:
+  group: build-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build: