Fix auto-deploy on first push from template

Fixed an issue where auto-deploy did not trigger on self-hosted instances when GitHub omitted commit details from the push event, such as the first push after creating a repository from a template.

• Fixed auto-deploy to fetch the pushed commit when the webhook payload omits it, so deployments trigger reliably.
• Fixed self-hosted GitHub App commits not being recognized as trusted, so template-clone deployments run with the right permissions.