ci: expand docs workflow triggers to include admin API and Ash resources (#1044)

The docs workflow now monitors additional backend paths to ensure
documentation is regenerated when the GraphQL schema changes due to
modifications in:
- Admin API modules that define GraphQL types and operations
- Ash resources and domains that are exposed through the schema

This prevents outdated API documentation when backend changes are made
outside the previously monitored schema directory.

Also updates copyright year to 2025.

Signed-off-by: Davide Briani <davide.briani@secomind.com>

Author: davidebriani

.github/workflows/docs-workflow.yaml

@@ -1,7 +1,7 @@
 #
 # This file is part of Edgehog.
 #
-# Copyright 2021-2024 SECO Mind Srl
+# Copyright 2021-2025 SECO Mind Srl
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -26,8 +26,11 @@ on:
     # Documentation pages
     - 'doc/**'
     # Schema files
+    - 'backend/lib/edgehog_web/admin_api/**'
     - 'backend/lib/edgehog_web/schema.ex'
     - 'backend/lib/edgehog_web/schema/**'
+    # Ash resources, including new Ash domains
+    - 'backend/lib/edgehog/**'
     - 'backend/mix.exs'
     - 'backend/mix.lock'
     # SpectaQL configuration file