maintainers: require GitHub handle (enforce via CI) (#437085)

Author: wolfgangwalther

lib/tests/maintainer-module.nix

@@ -7,6 +7,12 @@ in
     name = lib.mkOption {
       type = types.str;
     };
+    github = lib.mkOption {
+      type = types.str;
+    };
+    githubId = lib.mkOption {
+      type = types.ints.unsigned;
+    };
     email = lib.mkOption {
       type = types.nullOr types.str;
       default = null;
@@ -15,14 +21,6 @@ in
       type = types.nullOr types.str;
       default = null;
     };
-    github = lib.mkOption {
-      type = types.nullOr types.str;
-      default = null;
-    };
-    githubId = lib.mkOption {
-      type = types.nullOr types.ints.unsigned;
-      default = null;
-    };
     keys = lib.mkOption {
       type = types.listOf (
         types.submodule {