Some time ago, we set the default number of Sidekiq retries to 3. In the
next commit we're going to change that to 25, but we only want it to
apply to new workers. So we'll first need to explicitly set all existing
workers to 3.

To aid with this, I used the below script. I had to make a couple of
tweaks for some worker concerns, but it covered most of the several
hundred workers we have:

    Dir.glob('{ee/,}app/workers/**/*.rb').select do |worker|
      contents = open(worker).read

      next unless contents.include?('ApplicationWorker')
      next if contents.include?('sidekiq_options retry: ')

      new_contents =
        contents.gsub(/^( +)include ApplicationWorker$/,
                      "\\1include ApplicationWorker\n\n" +
                      "\\1sidekiq_options retry: 3")

      open(worker, 'w').puts(new_contents)
    end