Show header and footer system messages in email

* Add email_header_and_footer_enabled flag to appearances table
* Set email_header_and_footer_enabled default value to false
* Add checkbox to appearance to toggle show header and footer in emails
* Add email_header_and_footer_enabled to allowed params in controller
* Add header and footer messages to the html and text email layouts
* Remove the color styling for emails header and footer
* Add empty_mailer layout for emails without layout,
to have the header and footer applied

1 files changed, 17 insertions, 0 deletions

diff --git a/db/migrate/20190220142344_add_email_header_and_footer_enabled_flag_to_appearances_table.rb b/db/migrate/20190220142344_add_email_header_and_footer_enabled_flag_to_appearances_table.rb
new file mode 100644
index 00000000000..85b9e0580f4
--- /dev/null
+++ b/db/migrate/20190220142344_add_email_header_and_footer_enabled_flag_to_appearances_table.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class AddEmailHeaderAndFooterEnabledFlagToAppearancesTable < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  DOWNTIME = false
+
+  def up
+    add_column_with_default(:appearances, :email_header_and_footer_enabled, :boolean, default: false)
+  end
+
+  def down
+    remove_column(:appearances, :email_header_and_footer_enabled)
+  end
+end