dns-cache: ipv4hint/ipv6hint for DDR record

Author: hanazuki

gen/k8s/dns-cache/configmap.yml

@@ -70,9 +70,9 @@ server:
   # https://datatracker.ietf.org/doc/rfc9462/
   local-zone: resolver.arpa. static
   domain-insecure: resolver.arpa.
-  local-data: "_dns.resolver.arpa. 300 IN SVCB 1 resolver.rubykaigi.net. alpn=**,h3,h2 dohpath=/dns-query{?dns}"
-  local-data: "_dns.resolver.arpa. 300 IN SVCB 2 resolver.rubykaigi.net. alpn=dot"
-  local-data: "_dns.resolver.arpa. 300 IN SVCB 9 resolver.rubykaigi.net. alpn=http/1.1 dohpath=/dns-query{?dns}"
+  local-data: "_dns.resolver.arpa. 300 IN SVCB 1 resolver.rubykaigi.net. alpn=**,h3,h2 ipv4hint=192.50.220.164,192.50.220.165 ipv6hint=2001:df0:8500:ca6d:53::c,2001:df0:8500:ca6d:53::d dohpath=/dns-query{?dns}"
+  local-data: "_dns.resolver.arpa. 300 IN SVCB 2 resolver.rubykaigi.net. alpn=dot ipv4hint=192.50.220.164,192.50.220.165 ipv6hint=2001:df0:8500:ca6d:53::c,2001:df0:8500:ca6d:53::d"
+  local-data: "_dns.resolver.arpa. 300 IN SVCB 9 resolver.rubykaigi.net. alpn=http/1.1 ipv4hint=192.50.220.164,192.50.220.165 ipv6hint=2001:df0:8500:ca6d:53::c,2001:df0:8500:ca6d:53::d dohpath=/dns-query{?dns}"
 
   # https://datatracker.ietf.org/doc/rfc9606/
   # %w[qnamemin exterr=0-3,5-12,18,20,23 infourl=https://resolver.rubykaigi.net].flat_map { [it.size, *it.chars.map(&:ord)] }.map { "%02x" % it }.join.then { "\\# #{it.size/2} #{it}" }