Support for cgroup option

[kakoni]

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Description

I'm trying to run systemd container (rocky) using docker desktop for Mac using this provider. As per https://github.com/docker/for-mac/issues/6073 Containers running systemd need the following options: --privileged --cgroupns=host -v /sys/fs/cgroup:/sys/fs/cgroup:rw. however I believe there is no cgroupns option for docker_container resource.

New or Affected Resource(s)

• docker_container

Potential Terraform Configuration

resource "docker_container" "rocky" {
  name        = "rocky"
  image       = docker_image.rocky.image_id
  privileged = "true"
  cgroupns = "host"