Merge pull request 'API(cli): add method to Flake class to allow calling nix functions' (#3502) from hsjobeki/clan-core:improvements-2 into main

Reviewed-on: https://git.clan.lol/clan/clan-core/pulls/3502

lib/build-clan/module.nix

@@ -44,6 +44,7 @@ let
     buildInventory {
       inherit inventory directory;
       flakeInputs = config.self.inputs;
+      prefix = config._prefix ++ [ "inventoryClass" ];
     }
   );
 
@@ -204,6 +205,9 @@ in
 
     inherit inventoryClass;
 
+    # Endpoint that can be called to get a service schema
+    evalServiceSchema = clan-core.clanLib.evalServiceSchema config.self;
+
     # TODO: unify this interface
     # We should have only clan.modules. (consistent with clan.templates)
     inherit (clan-core) clanModules clanLib;