add template upload button

app/controllers/templates_uploads_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class TemplatesUploadsController < ApplicationController
+  def create
+    template = current_account.templates.new(author: current_user)
+    template.name = File.basename(params[:files].first.original_filename, '.*')
+
+    template.save!
+
+    documents = Templates::CreateAttachments.call(template, params)
+
+    schema = documents.map { |doc| { attachment_uuid: doc.uuid, name: doc.filename.base } }
+
+    template.update!(schema:)
+
+    redirect_to edit_template_path(template)
+  end
+end