Support deployment to remote Docker Hosts

[tomwillfixit]

Is your feature request related to a problem? Please describe.

I would like to deploy my containerized app to a remote Docker Host or Docker Swarm cluster.

Describe the solution you'd like

Something like this in waypoint.hcl to allow the deploy to happen to a remote host :

deploy { 
    use "docker" {
        remote_host=ssh://docker@your_server_ip
    }
  }

Support for Docker Swarm may be more complicated and out of scope of this request since Waypoint would need to support service creation, resource allocation etc.

Describe alternatives you've considered

Setting the DOCKER_HOST environment variable may work as is but I need to try it out.

Explain any additional use-cases

Docker Compose is very popular amongst developers for starting local and remote stacks, supporting remote docker hosts may make that easier using Waypoint.

Additional context

[nicholasjackson]

@tomwillfixit I have added this functionality in the following PR:

#631

I think for a more comprehensive Docker Swarm integration we should probably create a specific plugin.

[josephlim75]

For a workaround, can we execute the following ?, Of course docker environment need to be set beforehand, DOCKER_HOST, DOCKER_CERT_PATH, and DOCKER_TLS_VERIFY

deploy {
  use "exec" {
    command = ["docker", "stack", "deploy", "-c", "<TPL>", "stackname"]

  template {
    path = "./template/docker-compose.yaml"
  }
 }
}