Apex domains cannot have CNAME records.
Question and response
Question
dig galaxie.cloud. NS
Answer
galaxie.cloud. 5 NS ns-143-a.gandi.net.
galaxie.cloud. 5 NS ns-186-b.gandi.net.
galaxie.cloud. 5 NS ns-0-c.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0