As a user, I want to control which docker image tags are synced.
As it stands currently, syncing a docker image pulls down all the tags. Once synced, a tag may be removed. However, resyncing the repo will return the tag. This is not ideal since some repos have dozens of tags, many of which are unnecessary.
Allow specifying tags for initial sync.
Once a tag is synced, if it is removed do not sync it any longer. Do sync new tags.