Specify the user the cronjobs run as.
Specify the user the cronjobs run as.

The `$::backup::client::user` variable doesn't exist and we use `govuk-backup`
everywhere so we'll use the literal value here.

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