Add trailing dot to cnames

This makes the behavior consistent between NS, MX, SRV and CNAME records

CHANGELOG.md

@@ -0,0 +1,10 @@
+# 2024-05-06
+If you use CNAMEs a trailing dot will now be added automatically.
+This behavior is in line with other record types that use dns names.
+
+This breaks using subdomain paths in CNAMEs and if you are using full domain names
+in CNAMEs you will need to remove the trailing dot in your config.
+
+`zones."example.org"."example".cname.data = "example2"`-> `example.example.org IN CNAME example2.`
+You will now have to write it as:
+`zones."example.org"."example".cname.data = "example2.example.org"`-> `example.example.org IN CNAME example2.example.org.`

modules/records.nix

@@ -84,7 +84,7 @@ lib.mapAttrs
             '';
             example = "foo.example.com";
             type = with lib.types; nullOr str; # change str to lib.types.domain once it exists
-            apply = x: if x != null then lib.toList x else x;
+            apply = x: if x != null then lib.toList "${x}." else x;
           };
           sub = {
             apply = lib.toList;