Add vagrant cloud taken for uploads

sources/build.pkr.hcl

@@ -22,6 +22,7 @@ build {
 
 		post-processor "vagrant-cloud" {
 			name = "upload"
+			access_token = var.vagrant_cloud_token
 			box_tag = "boxen/${local.name}"
 			version = local.build
 			version_description = local.description

sources/inputs.pkr.hcl

@@ -57,6 +57,11 @@ variable "headless" {
 	default = true
 }
 
+variable "vagrant_cloud_token" {
+	type = string
+	default = env("VAGRANT_CLOUD_TOKEN")
+}
+
 locals {
 	name = "${var.distro}-${var.version}-${var.arch}"
 	build = formatdate("YYYYMMDDhh", timestamp())