Merge pull request 'coredns binds to 0.0.0.0:53' (#30) from develop into master

Reviewed-on: #30

hosts/sid/services/coredns.nix

@@ -10,7 +10,7 @@
     enable = true;
     config = with constants; ''
       .:53 {
-        bind 127.0.0.1
+        bind 0.0.0.0
         hosts {
           ${hosts.sid.ip} ${ca-fqdn} 
 
@@ -29,4 +29,7 @@
       }
     '';
   };
+
+  networking.firewall.allowedUDPPorts = [ 53 ];
+  networking.firewall.allowedTCPPorts = [ 53 ];
 }