GeoBlacklight Sidecar Images

https://github.com/geoblacklight/geoblacklight_sidecar_images

This GeoBlacklight plugin captures remote images from geographic web services and saves them locally. It borrows the concept of a SolrDocumentSidecar from Spotlight, to have an ActiveRecord-based “sidecar” to match each non-AR SolrDocument. This allows us to use ActiveStorage to attach images to our solr documents.