(maint) Make sure base Dockerfile is not clobbered
(maint) Make sure base Dockerfile is not clobbered

 - Copy the base Dockerfile to /base.Dockerfile instead of /Dockerfile
   so that derived containers don't overwrite it when they build

puppetlabs/puppet-server,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver,puppetlabs/puppetserver