helm_release.rancher_server: Creating...
╷
│ Error: could not download chart: Chart.yaml file is missing
│
│   with helm_release.rancher_server,
│   on <http://helm.tf|helm.tf> line 32, in resource "helm_release" "rancher_server":
│   32: resource "helm_release" "rancher_server" {
│
╵

any idea how to debug this?

you can start from terraform debug mode