ability to share template with testing account

app/controllers/templates_preview_controller.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class TemplatesPreviewController < ApplicationController
+  load_and_authorize_resource :template
+
+  def show
+    ActiveRecord::Associations::Preloader.new(
+      records: [@template],
+      associations: [schema_documents: { preview_images_attachments: :blob }]
+    ).call
+
+    @template_data =
+      @template.as_json.merge(
+        documents: @template.schema_documents.as_json(
+          methods: [:metadata],
+          include: { preview_images: { methods: %i[url metadata filename] } }
+        )
+      ).to_json
+
+    render :show, layout: 'plain'
+  end
+end