feat(lambda): add support to purge in two zones

[newman-dani]

Description

This pull request adds support for purging cache in multiple Cloudflare zones and improves error handling and test coverage for the cache purging logic. The main changes include refactoring the handler to support dual zone purging, updating error reporting to handle partial failures, and expanding the test suite to cover these new scenarios.

Dual zone cache purging:

• Refactored the handler in src/index.ts to support purging cache in two Cloudflare zones if both CLOUDFLARE_ZONE_ID_2 and BASE_URL_2 environment variables are set. The handler now iterates over all configured zones and purges cache for each. [1] [2]

• Updated error handling in src/index.ts so that if cache purging fails in any zone, the error message specifies which zone(s) failed and why, instead of throwing a generic error.

Test coverage improvements:

• Added new tests in tests/index.test.ts to verify dual zone purging, partial failures (where one zone succeeds and another fails), and scenarios where only one zone is configured.

• Updated environment variable cleanup in test setup to include the new zone variables, ensuring test isolation.

Minor update:

• Updated the S3 object key in events/event.json to reflect a new test case.

Must

• Tests
• Documentation (if applicable)

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[Copilot]

Pull Request Overview

This PR adds support for purging cache in multiple Cloudflare zones within a Lambda function, allowing the handler to work with both primary and secondary zones when configured. The implementation includes improved error handling that provides detailed feedback about which zones failed during cache purging operations.

Key changes:

• Enhanced handler to support dual zone purging when both CLOUDFLARE_ZONE_ID_2 and BASE_URL_2 environment variables are set
• Updated error handling to report specific zone failures instead of generic connection errors
• Expanded test coverage to verify dual zone functionality, partial failures, and single zone configurations

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/index.ts	Refactored handler to support multiple zones with improved error reporting
tests/index.test.ts	Added comprehensive test coverage for dual zone scenarios and updated existing tests
events/event.json	Minor update to S3 object key for testing purposes

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