If you are running the Terraform Runner in the target cluster, you additionally need to:

TF Runner Kubernetes Role 
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: terraform-runner-role
  namespace: tf-runner-namespace
rules:
- apiGroups: ["batch"]
  resources: ["jobs"]
  verbs    : ["create", "delete"]
- apiGroups: [""]
  resources: ["secrets"]
  verbs    : ["get", "create", "delete", "deletecollection"]

Serverless