maintenance: add rake tasks for maintenance jobs.

lib/tasks/maintenance.rake

@@ -0,0 +1,18 @@
+require "tasks/newrelic" if defined?(NewRelic)
+
+namespace :maintenance do
+  desc "Run hourly maintenance jobs"
+  task hourly: :environment do
+    Maintenance.hourly
+  end
+
+  desc "Run daily maintenance jobs"
+  task daily: :environment do
+    Maintenance.daily
+  end
+
+  desc "Run weekly maintenance jobs"
+  task weekly: :environment do
+    Maintenance.weekly
+  end
+end