nixos/home-assistant: add custom components to used components query

There should be no need to add custom components without YAML configuration to
extraComponents for systemd service modifications to become effective (e.g.
serial access).

nixos/modules/services/home-automation/home-assistant.nix

@@ -20,6 +20,7 @@ let
     filter
     filterAttrsRecursive
     flatten
+    getAttr
     hasAttrByPath
     isAttrs
     isDerivation
@@ -111,7 +112,9 @@ let
     hasAttrByPath (splitString "." component) cfg.config
     || useComponentPlatform component
     || useExplicitComponent component
-    || builtins.elem component (cfg.extraComponents ++ cfg.defaultIntegrations);
+    || builtins.elem component (
+      cfg.extraComponents ++ cfg.defaultIntegrations ++ map (getAttr "domain") cfg.customComponents
+    );
 
   # Final list of components passed into the package to include required dependencies
   extraComponents = filter useComponent availableComponents;