## Problem
We often get errors while starting the local supabase instance on CI. We
added diagnostics but they are targeting the wrong port.
## Solution
Fix the diagnostics logs
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Granted additional CI credentials and added cloud role assumption plus
container registry login before running self‑hosted end-to-end tests.
* Improved workflow diagnostics to check an alternate local database
port (54322) and show clearer messages when the service is not
listening.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Gildas Garcia
9fc8109067