add pdf generation

app/controllers/submissions_debug_controller.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class SubmissionsDebugController < ApplicationController
+  layout 'flow'
+
+  skip_before_action :authenticate_user!
+
+  def index
+    @submission = Submission.preload({ attachments_attachments: :blob },
+                                     flow: { documents_attachments: :blob })
+                            .find_by(slug: params[:submission_slug])
+
+    respond_to do |f|
+      f.html do
+        render 'submit_flow/show'
+      end
+      f.pdf do
+        Submissions::GenerateResultAttachments.call(@submission)
+
+        send_data ActiveStorage::Attachment.where(name: :documents).last.download,
+                  filename: 'debug.pdf',
+                  disposition: 'inline',
+                  type: 'application/pdf'
+      end
+    end
+  end
+end