Apex domains cannot have CNAME records.
Question and response
Question
dig services-infra.ch. NS
Answer
services-infra.ch. 5 NS dns1.arcanite-infra.ch.
services-infra.ch. 5 NS dns2.services-infra.ch.
services-infra.ch. 5 NS dns1.services-infra.ch.
Authority
The response has no authority records.
Additional
dns1.arcanite-infra.ch. 5 A 37.187.196.163
dns1.services-infra.ch. 5 A 62.106.93.21
dns2.services-infra.ch. 5 A 62.106.93.22
dns1.arcanite-infra.ch. 5 AAAA 2001:41d0:303:412a:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0