data/defaults: Add swh-loader-git-disk instance
data/defaults: Add swh-loader-git-disk instance

Related T673
Related T312

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