Add concurrency cancel and ignore docs/markdown changes across CI workflows (#168)

* Add concurrency cancel and ignore docs/markdown changes across CI workflows

* Clarify PR-only concurrency (no push queuing)

.github/workflows/scorecard.yml

@@ -10,9 +10,17 @@ on:
   # To guarantee Maintained check is occasionally updated. See
   # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
   schedule:
-    - cron: '35 22 * * 0'
+    - cron: "35 22 * * 0"
   push:
-    branches: [ "main" ]
+    branches: ["main"]
+    paths-ignore:
+      - "**/*.md"
+      - "docs/**"
+
+# PRs share a concurrency group (cancel/serialize); Pushes use unique groups to avoid cancellation/queuing
+concurrency:
+  group: ${{ github.workflow }}-${{ (github.event_name == 'pull_request' && github.ref) || github.run_id }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 # Declare default permissions as read only.
 permissions: read-all