Extend Apps Infra CODEOWNERS routing

Widens the Ruby-only routing block to the broader Apps Infra
surface (CI config, automation, toolchain pins), per the
dependabot-bootstrap campaign (AINFRA-2437).
Only paths present in this repo are included.

---

Generated with the help of Claude Code, https://code.claude.com

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mokagio

.github/CODEOWNERS

@@ -3,3 +3,10 @@ Gemfile*       @wordpress-mobile/apps-infra-tooling
 .ruby-version  @wordpress-mobile/apps-infra-tooling
 .bundle/       @wordpress-mobile/apps-infra-tooling
 .rubocop*.yml  @wordpress-mobile/apps-infra-tooling
+fastlane/      @wordpress-mobile/apps-infra-tooling
+
+# CI and automation
+.buildkite/            @wordpress-mobile/apps-infra-tooling
+.github/workflows/     @wordpress-mobile/apps-infra-tooling
+.github/dependabot.yml @wordpress-mobile/apps-infra-tooling
+Dangerfile*            @wordpress-mobile/apps-infra-tooling