Terraform docker, cannot get volumes working

I am trying to automate the process of creating a docker instance of a pihole using TF.

For this, I’ve got the majority of my stuff working except for the volumes.
When I do create the volumes using volumes the contents of my host_path never end up on the actual docker instance. I’ve checked that by using docker exec -it XXX /bin/sh and inside /etc/pihole/ there is nothing.

# main.tf
resource "docker_container" "pihole" {
  name  = var.container_name
  image = docker_image.pihole.latest
  dynamic "volumes" {
    for_each = var.volume_mappings
    iterator = each
    content {
      volume_name    = each.value.volume_name
      host_path      = each.value.host_path
      container_path = each.value.container_path
      read_only      = each.value.read_only

# variables.tf
variable "volume_mappings" {
  description = "List of all the volume mappings"
  type        = list(any)
  default = [
      volume_name    = "data"
      host_path      = "/terraform/pihole/etc-pihole/"
      container_path = "/etc/pihole/"
      read_only      = false
      volume_name    = "dnsmasq"
      host_path      = "/terraform/pihole/etc-dnsmasq.d/"
      container_path = "/etc/dnsmasq.d/"
      read_only      = false

When I switch from using volumes to using mounts I cannot get it working, it always gives me this error

  mounts {
    target = "/home/darcey/Desktop/terraform/pihole/pihole/"
    source = "/etc/pihole/"
    type = "bind"
    read_only = false
    bind_options {
      propagation = "rprivate"
│ Error: Unable to create container: Error response from daemon: invalid mount config for type "bind": bind source path does not exist: /etc/pihole/
│   with docker_container.pihole,
│   on main.tf line 25, in resource "docker_container" "pihole":
│   25: resource "docker_container" "pihole" {

What I find bizarre is that when I do the docker-compose up everything works like a charm. When I try to automate that pihole with TF and I set up the machine private IP and my DNS I lose internet connection.