How to create "DNS entries" for localhost kubernetes ingress hosts?

Here's what I've come up with:

I've created a wildcard certificate in a real DNS entry in a domain I own. Something like

*.local.mydomain.dk. IN A 127.0.0.1

Now the trick is to get coredns (the DNS server in the kubernetes cluster) to resolve *.local.mydomain.dk to a CNAME host.docker.internal. To do that, I've modified both the configmap and deployment called coredns in the kube-system name space:

diff -u configmap.yaml.orig configmap.yaml--- configmap.yaml.orig 2021-08-10 00:24:29.234095600 +0200+++ configmap.yaml  2021-08-10 00:24:37.664095600 +0200@@ -7,6 +7,7 @@            lameduck 5s         }         ready+        file /etc/coredns/mydomain.dk.db local.mydomain.dk         kubernetes cluster.local in-addr.arpa ip6.arpa {            pods insecure            fallthrough in-addr.arpa ip6.arpa@@ -21,6 +22,11 @@         reload         loadbalance     }+  mydomain.db: |+    local.mydomain.dk.   IN SOA   sns.dns.icann.org. noc.dns.icann.org. 2015082541 7200 3600 1209600 3600+    local.mydomain.dk.   IN NS    a.iana-servers.net.+    local.mydomain.dk.   IN NS    b.iana-servers.net.+    *.local.mydomain.dk. IN CNAME host.docker.internal. kind: ConfigMap metadata:   creationTimestamp: "2021-08-09T21:58:26Z"

diff -u deployment.yaml.orig deployment.yaml--- deployment.yaml.orig    2021-08-10 00:26:17.324095600 +0200+++ deployment.yaml 2021-08-10 00:25:57.584095600 +0200@@ -108,6 +108,8 @@           items:           - key: Corefile             path: Corefile+          - key: mydomain.dk.db+            path: mydomain.dk.db           name: coredns         name: config-volume status:

Now whatever.local.mydomain.dk resolves to 127.0.0.1 in the browser and to host.docker.internal inside pods. Bingo!