data/defaults: Add journal_publisher's configuration
data/defaults: Add journal_publisher's configuration

Related T424
Related T527

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site