Extend Apps Infra CODEOWNERS routing to CI and toolchain (#22970)

* 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.

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

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

* Add Secrets stanza to CODEOWNERS

Route a8c configure secret material (.configure-files/) to
apps-infra-tooling, per AINFRA-2437.

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: mokagio

.github/CODEOWNERS

@@ -5,3 +5,16 @@ 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
+
+# Toolchain and environment pins
+.java-version  @wordpress-mobile/apps-infra-tooling
+
+# Secrets
+.configure-files/     @wordpress-mobile/apps-infra-tooling