chore: Schedule TICS (#187)

This pull request introduces a small enhancement to the GitHub Actions
workflow configuration. It adds a scheduled cron job to trigger the
`TICS run self-hosted test` workflow every Saturday at 2:00 AM UTC.

*
[`.github/workflows/tics_run_sh_ghaction_test.yml`](diffhunk://#diff-594936f70c4be3041fe643be75996fd4d5d1c50675521239e0d7811b85790b90R4-R5):
Added a `schedule` block with a cron expression to automate the workflow
execution weekly.

Author: skourta

.github/workflows/tics_run_sh_ghaction_test.yml

@@ -1,6 +1,8 @@
 name: TICS run self-hosted test (github-action)
 
 on:
+  schedule:
+    - cron: "0 2 * * 6" # Every Saturday 2:00 AM UTC
   workflow_dispatch: # Allows manual triggering
 
 jobs: