feat(TALE-30): add support for new DNS configs

This is a breaking change to support 0.23-beta2

test/config.yaml

@@ -198,7 +198,7 @@ policy:
 # - https://tailscale.com/kb/1081/magicdns/
 # - https://tailscale.com/blog/2021-09-private-dns-with-magicdns/
 #
-dns_config:
+dns_config2:
   # Whether to prefer using Headscale provided DNS or use local.
   override_local_dns: true
 
@@ -259,6 +259,64 @@ dns_config:
       type: A
       value: 1.1.1.1
 
+dns:
+  # Whether to use [MagicDNS](https://tailscale.com/kb/1081/magicdns/).
+  # Only works if there is at least a nameserver defined.
+  magic_dns: true
+
+  # Defines the base domain to create the hostnames for MagicDNS.
+  # This domain _must_ be different from the server_url domain.
+  # `base_domain` must be a FQDN, without the trailing dot.
+  # The FQDN of the hosts will be
+  # `hostname.base_domain` (e.g., _myhost.example.com_).
+  base_domain: example.com
+
+  # List of DNS servers to expose to clients.
+  nameservers:
+    global:
+      - 1.1.1.1
+      - 1.0.0.1
+      - 2606:4700:4700::1111
+      - 2606:4700:4700::1001
+
+      # NextDNS (see https://tailscale.com/kb/1218/nextdns/).
+      # "abc123" is example NextDNS ID, replace with yours.
+      # - https://dns.nextdns.io/abc123
+
+    # Split DNS (see https://tailscale.com/kb/1054/dns/),
+    # a map of domains and which DNS server to use for each.
+    split:
+      {}
+      # foo.bar.com:
+      #   - 1.1.1.1
+      # darp.headscale.net:
+      #   - 1.1.1.1
+      #   - 8.8.8.8
+
+  # Set custom DNS search domains. With MagicDNS enabled,
+  # your tailnet base_domain is always the first search domain.
+  search_domains: []
+
+  # Extra DNS records
+  # so far only A-records are supported (on the tailscale side)
+  # See https://github.com/juanfont/headscale/blob/main/docs/dns-records.md#Limitations
+  extra_records: []
+  #   - name: "grafana.myvpn.example.com"
+  #     type: "A"
+  #     value: "100.64.0.3"
+  #
+  #   # you can also put it in one line
+  #   - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.3" }
+
+  # DEPRECATED
+  # Use the username as part of the DNS name for nodes, with this option enabled:
+  # node1.username.example.com
+  # while when this is disabled:
+  # node1.example.com
+  # This is a legacy option as Headscale has have this wrongly implemented
+  # while in upstream Tailscale, the username is not included.
+  use_username_in_magic_dns: false
+
 # Unix socket used for the CLI to connect without authentication
 # Note: for production you will want to set this to something like:
 unix_socket: /var/run/headscale/headscale.sock