Run CI weekly to catch issues with new dependency versions

Author: object-Object

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
     tags: 'v[0-9]+![0-9]+.[0-9]+.[0-9]+*'
   pull_request:
     branches: "*"
+  schedule:
+    # run every Saturday at 11 EST / 12 EDT
+    # because new Pydantic versions keep breaking things :(
+    - cron: 0 16 * * 6
 
 permissions:
   contents: read