Add admin notifications for new Mastodon versions (#26582)

app/workers/scheduler/software_update_check_scheduler.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Scheduler::SoftwareUpdateCheckScheduler
+  include Sidekiq::Worker
+
+  sidekiq_options retry: 0, lock: :until_executed, lock_ttl: 1.hour.to_i
+
+  def perform
+    SoftwareUpdateCheckService.new.call
+  end
+end