## Why
The new terraform-rancher CI pipeline runs as a pod in the woodpecker namespace; its ServiceAccount token is what Vault binds to the `woodpecker_terraform_rancher` k8s auth role (see terraform-vault#86) for rancher2 provider auth + Consul state.
## Change
- Add `ServiceAccount/terraform-rancher` (woodpecker ns) and wire it into the woodpecker kustomization, mirroring the other terraform-* runner SAs.
## Validation
`kustomize build apps/base/woodpecker` renders it; pre-commit clean.
Reviewed-on: #257
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
