Re-deploy ALI every Monday morning (#339)

This serves 2 purposes:

1) To ensure that the deployed ALI is synced with what is in ci-infra 
2) To allow scaledown to terminate unused runners

Allowing scaledown to terminate runners might be beneficial to save on
spend.

Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

Author: zxiiro

.github/workflows/ali-deploy-prod.yml

@@ -1,6 +1,8 @@
 name: Terraform Apply / Runners / Production - ALI
 
 on:
+  schedule:
+    - cron: "0 12 * * 1"  # Monday mornings at 7 or 8 AM ET
   workflow_dispatch:
 
 concurrency: