Connecting back to the Docker host

[jameslewis4891]

When I receive a request to ask if a container can be started I would like to go back to the docker host and get the sha256 of the image thats being started. However I am getting errors indicating the plugin cannot talk to /var/run/docker.sock

I have the following code just trying to list the containers at present

func getContainers() {
	fmt.Printf("***** Container List\n")
	cli, err := client.NewClientWithOpts(client.FromEnv)
	if err != nil {
		panic(err)
	}

	containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{})
	if err != nil {
		panic(err)
	}

	for _, container := range containers {
		fmt.Printf("%s %s\n", container.ID[:10], container.Image)
	}
}

When running my container before creating the plugin I can achieve the desired behaviour by running the container as follows

docker run -v /var/run/docker.sock:/var/run/docker.sock ${TEMPLATE}:${VERSION}

I believe there is some config somewhere in the config.json to achieve the same thing but I cannot seem to do it I have tried

    "PropagatedMount": "/var/run/docker.sock",
    "Mounts": [
      {
          "Type": "bind",
          "Source": "/var/run/docker.sock",
          "Destination": "/var/run/docker.sock",
          "Mode": "",
          "RW": true,
          "Propagation": "rprivate"
      }
  ]

Any thoughts?