Saltize Docker images to fetch
The Dwellers list has been established from get-containers-list
for not custom built containers (Discourse, Mastodon).
The Equatower list starts with the Jenkins instance to provision there.
Tested both on Dwellers (all already present)
and Equatower (images have been successfully fetched).
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D1409