msan images: run the clang 22 (development) version month

Author: grooverdan

.github/workflows/build-debian.msan-based.yml

@@ -27,9 +27,13 @@ on:
       - .github/workflows/build-debian.msan-based.yml
       - .github/workflows/bbw_build_container_template.yml
   workflow_call:
+  schedule:
+    - cron: '0 3 3 * *' # Third of the month
 
 jobs:
   build-images:
+    if: |
+      github.event_name != 'schedule' || matrix.clang_version == 22
     strategy:
       fail-fast: false
       matrix: