Keep stats up to date by rebuilding them once a day

Refs https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule

.github/workflows/ci.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - 'main'
   pull_request:
+  schedule:
+    - cron: '0 0 * * *'
 
 permissions:
   contents: read