Change key from 'gitea' to 'platform/gitea' to match the
new categorized Vault secret structure.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Rename EventListener from github-listener to gitea-listener
- Rename TriggerBinding from github-push-binding to gitea-push-binding
- Update webhook secret to gitea-webhook-secret
- Rename credentials from github to gitea
- Update Ingress service name to el-gitea-listener
- Update Vault secret paths from github to gitea
