Remove reference to foreman
Remove reference to foreman

Foreman is no longer part of Publisher's Gemfile, so this was generating errors
about foreman missing when bowling publisher. This change gets it to run
sidekiq directly, like other apps do.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet