kea: T7821: Add Kea 3.0 arm64 repository

Author: sarthurdev

data/architectures/arm64.toml

@@ -12,3 +12,8 @@ squashfs_compression_type = "xz -b 256k -always-use-fragments -no-recovery"
 
 [additional_repositories.zabbix]
   url = "https://repo.zabbix.com/zabbix/6.0/debian-arm64"
+
+[additional_repositories.kea]
+  architecture = "arm64"
+  url = "https://dl.cloudsmith.io/public/isc/kea-3-0/deb/debian"
+  distribution = "bookworm"