method A: copy key for bob into bob's account.. copy joe's key into joes account

  $idcadmin_user_keys  = [ "bob", "joe" ]
  auth::key { $idcadmin_user_keys: ensure => append }


method b: copy a list of keys ($user_keys) into 'build' account

  $user_keys  = [ file("/etc/puppet/files/idcadmin/auth/keys/bob.pub"), 
      file("/etc/puppet/files/idcadmin/auth/keys/joe.pub") ]

  auth::key { build:
      ensure    => replace,
      sourcekeys  => $user_keys,
  }