Track historical space stats in PgHero to determine PostgreSQL growth (#8906)

app/workers/scheduler/pghero_scheduler.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Scheduler::PgheroScheduler
+  include Sidekiq::Worker
+
+  sidekiq_options unique: :until_executed, retry: 0
+
+  def perform
+    PgHero.capture_space_stats
+  end
+end