Apex domains cannot have CNAME records.
Question and response
Question
dig rudetools.dev. NS
Answer
rudetools.dev. 5 NS maceio.ns.porkbun.com.
rudetools.dev. 5 NS salvador.ns.porkbun.com.
rudetools.dev. 5 NS curitiba.ns.porkbun.com.
rudetools.dev. 5 NS fortaleza.ns.porkbun.com.
Authority
The response has no authority records.
Additional
maceio.ns.porkbun.com. 4 A 162.159.11.180
curitiba.ns.porkbun.com. 4 A 173.245.58.37
salvador.ns.porkbun.com. 4 A 162.159.10.150
fortaleza.ns.porkbun.com. 4 A 162.159.8.140
maceio.ns.porkbun.com. 4 AAAA 2400:cb00:2049:1:0:0:a29f:bb4
curitiba.ns.porkbun.com. 4 AAAA 2400:cb00:2049:1:0:0:adf5:3a25
salvador.ns.porkbun.com. 4 AAAA 2400:cb00:2049:1:0:0:a29f:a96
fortaleza.ns.porkbun.com. 4 AAAA 2400:cb00:2049:1:0:0:a29f:88c
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0