Until now, Helm still doesn't support directly installing chart from an OCI registry.

The recommended steps are:

1. helm chart remove mycontainerregistry.azurecr.io/helm/hello-world:v1
2. helm chart pull mycontainerregistry.azurecr.io/helm/hello-world:v1
3. helm chart export mycontainerregistry.azurecr.io/helm/hello-world:v1 --destination ./install
4. cd install & helm install myhelmtest ./hello-world

So my solution is:

resource "null_resource" "download_chart" {
  provisioner "local-exec" {
    command = <<-EOT
      export HELM_EXPERIMENTAL_OCI=1
      helm registry login mycontainerregistry.azurecr.io --username someuser --password somepass
      helm chart remove mycontainerregistry.azurecr.io/helm/hello-world:v1
      helm chart pull mycontainerregistry.azurecr.io/helm/hello-world:v1
      helm chart export mycontainerregistry.azurecr.io/helm/hello-world:v1 --destination ./install
    EOT
  }
}

resource "helm_release" "chart" {
  name             = "hello_world"
  repository       = "./install"
  chart            = "hello-world"
  version          = "v1"

  depends_on = [null_resource.download_chart]
}

Not perfect but works.

Hope this helps.

Until now, Helm still doesn't support directly installing chart from an OCI registry.

The recommended steps are:

1. helm chart remove mycontainerregistry.azurecr.io/helm/hello-world:v1
2. helm chart pull mycontainerregistry.azurecr.io/helm/hello-world:v1
3. helm chart export mycontainerregistry.azurecr.io/helm/hello-world:v1 --destination ./install
4. cd install & helm install myhelmtest ./hello-world

So my solution is:

resource "null_resource" "download_chart" {
  provisioner "local-exec" {
    command = <<-EOT
      export HELM_EXPERIMENTAL_OCI=1
      helm registry login mycontainerregistry.azurecr.io --username someuser --password somepass
      helm chart remove mycontainerregistry.azurecr.io/helm/hello-world:v1
      helm chart pull mycontainerregistry.azurecr.io/helm/hello-world:v1
      helm chart export mycontainerregistry.azurecr.io/helm/hello-world:v1 --destination ./install
    EOT
  }
}

resource "helm_release" "chart" {
  name             = "hello_world"
  repository       = "./install"
  chart            = "hello-world"
  version          = "v1"

  depends_on = [null_resource.download_chart]
}

Not perfect but works.