crawler: add crawler

hosts/thegeneralist-central/dns.nix

@@ -27,6 +27,20 @@ let
     ns  IN A    100.86.129.23
     @   IN A    100.86.129.23
   '';
+
+  crawlerZoneFile = pkgs.writeText "crawler.zone" ''
+    $ORIGIN crawler.thegeneralist01.com.
+    @   IN SOA  ns.crawler.thegeneralist01.com. thegeneralist01.proton.me. (
+          2025080801 ; serial (yyyymmddXX)
+          3600       ; refresh
+          600        ; retry
+          86400      ; expire
+          3600       ; minimum
+    )
+        IN NS   ns.crawler.thegeneralist01.com.
+    ns  IN A    100.86.129.23
+    @   IN A    100.86.129.23
+  '';
 in
 {
   services.coredns = {
@@ -44,6 +58,12 @@ in
         errors
       }
 
+      crawler.thegeneralist01.com:53 {
+        file ${crawlerZoneFile}
+        log
+        errors
+      }
+
       .:53 {
         forward . 100.100.100.100 45.90.28.181 45.90.30.181
         cache