Generate list of application version info for /admin/docker page

Generate a list of the different application versions to be used on the
/admin/docker page.

This will pretty much feed the /admin/docker page for the list of application versions.

Idea from: https://meta.discourse.org/t/put-the-version-numbers-for-the-different-applications-used-in-the-admin-docker-page/14124/4