chore: schedule montly execution for Trivy

Author: bbsnly

.github/workflows/trivy.yml

@@ -11,6 +11,8 @@ on:
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [ "main" ]
+  schedule:
+    - cron: '0 0 1 * *'  # Runs at midnight on the first day of every month
 
 permissions:
   contents: read