0bf6e80d6f
- Add externaldns base ArgoCD application with namespace and Vault integration - Create externaldns overlay for au-syd1 with Helm chart configuration - Update platform ApplicationSet to include externaldns deployment - Configure external-dns v1.19.0 with RFC2136 provider for DNS updates - Maintain one-to-one migration from Terraform configuration including TSIG secrets Reviewed-on: #43