Add list_apps_cdn_builds action

[iangmaia]

Fixes AINFRA-2102

Summary

Adds a new list_apps_cdn_builds Fastlane action that queries the WP REST API v2 to list builds on the Apps CDN. Supports server-side filtering by post_status (draft / publish) and version (via taxonomy term ID lookup). Returns an array of build metadata (post_id, title, status, version, visibility, platform, build_type).

Context

This enables Studio's publish_release lane to query the CDN directly for draft builds by version, then publish them — rather than embedding post IDs in the GitHub release body (which is fragile). See companion Studio PR for the consumer side.

Note: The v1.1 API returns 500 for a8c_cdn_build custom post types, which is why this action uses the WP v2 endpoint (/wp/v2/sites/{site_id}/a8c_cdn_build). Additionally, CDN posts with visibility: internal are completely hidden from all listing queries by the CDN plugin, so the draft/publish approach is used instead of internal/external visibility for gating builds before release.

Test plan

• bundle exec rspec spec/list_apps_cdn_builds_spec.rb — 12 examples, 0 failures
• bundle exec rubocop — no offenses on new files
• Manual test: verified against the real CDN API that listing by post_status and version works correctly, including the full draft→publish roundtrip

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a new Fastlane action to query the WordPress.com REST API for Apps CDN build posts, enabling lanes (e.g., Studio release automation) to locate builds by visibility and version without relying on hard-coded post IDs.

Changes:

• Introduced list_apps_cdn_builds action with server-side visibility filtering and client-side version filtering.
• Added RSpec coverage for the new action behavior and error/validation paths.
• Updated CHANGELOG.md to document the new action.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
lib/fastlane/plugin/wpmreleasetoolkit/actions/common/list_apps_cdn_builds.rb	Implements the new list_apps_cdn_builds action and its parameter validation / API request logic.
spec/list_apps_cdn_builds_spec.rb	Adds tests for listing behavior, filtering, error handling, and parameter validation.
CHANGELOG.md	Documents the new action under Trunk → New Features.

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[AliSoftware]

Note: The v1.1 API returns 500 for a8c_cdn_build custom post types, which is why this action uses the WP v2 endpoint (/wp/v2/sites/{site_id}/a8c_cdn_build).

Should we then update upload_build_to_apps_cdn action to use the /v2 API endpoint too, for consistency?

[iangmaia]

No longer needed. The new Studio PR (Automattic/studio#2724) uses the internal visibility approach with post IDs embedded in the GitHub release body, so there's no need to query the CDN API for builds. Only the update_apps_cdn_build_metadata action (#701) is required.