Restore path specifications for when the stack size CI should be run

Also schedules a weekly run to ensure this doesn't inadvertently decay.

Author: kayabaNerve

.github/workflows/stack_size.yml

@@ -2,8 +2,15 @@ name: Check Update Default Stack Size
 
 on:
   push:
+    paths:
+      - "orchestration/increase_default_stack_size.sh"
   pull_request:
+    paths:
+      - "orchestration/increase_default_stack_size.sh"
   workflow_dispatch:
+  # Also run weekly to ensure this doesn't inadvertently decay
+  schedule:
+    - cron: "0 0 * * 1"
 
 jobs:
   stack_size: