test(e2e): Add an enos module for docker-based workers (#3603)

* test(e2e): Add an enos module for a worker in docker

* fixup! test(e2e): Add an enos module for a worker in docker

enos/modules/docker_openssh_server/main.tf

@@ -25,8 +25,8 @@ variable "image_name" {
   default     = "docker.mirror.hashicorp.services/linuxserver/openssh-server:latest"
 }
 variable "network_name" {
-  description = "Name of Docker Network"
-  type        = string
+  description = "Name of Docker Networks to join"
+  type        = list(string)
 }
 variable "container_name" {
   description = "Name of Docker Container"
@@ -66,8 +66,11 @@ resource "docker_container" "openssh_server" {
     "USER_NAME=${var.target_user}",
     "PUBLIC_KEY=${local.public_key}",
   ]
-  networks_advanced {
-    name = var.network_name
+  dynamic "networks_advanced" {
+    for_each = var.network_name
+    content {
+      name = networks_advanced.value
+    }
   }
   ports {
     internal = 2222