These records were previously configured manually in the GleSYS web UI
during our DNS outage (b/155).
Note that I could not find a way to `terraform import` these records
and have instead recreated the set and then cleaned up in the UI.
Since we often point things at whitby, I have extracted variables for
its IPs in this change.
Change-Id: I09fda94d3734e8aaa278fa858e160d046740da1e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4714
Tested-by: BuildkiteCI
Autosubmit: tazjin <mail@tazj.in>
Reviewed-by: grfn <grfn@gws.fyi>
