feat(secretmanager): Added samples related to Secret Rotation

[dhavalbhensdadiya-crest]

As part of this feature, we have added global and regional samples for below features:

1. Create Secret With Rotation
2. Update Secret With Rotation
3. Remove Rotation from Secret

Please merge this PR once approved

[snippet-bot]

Here is the summary of changes.

You are about to add 30 region tags.

• secretmanager/src/create_regional_secret_with_cmek.php:28, tag secretmanager_create_regional_secret_with_cmek
• secretmanager/src/create_regional_secret_with_expiration.php:28, tag secretmanager_create_regional_secret_with_expiration
• secretmanager/src/create_regional_secret_with_rotation.php:28, tag secretmanager_create_regional_secret_with_rotation
• secretmanager/src/create_regional_secret_with_topic.php:28, tag secretmanager_create_regional_secret_with_topic
• secretmanager/src/create_secret_with_cmek.php:28, tag secretmanager_create_secret_with_cmek
• secretmanager/src/create_secret_with_expiration.php:28, tag secretmanager_create_secret_with_expiration
• secretmanager/src/create_secret_with_rotation.php:28, tag secretmanager_create_secret_with_rotation
• secretmanager/src/create_secret_with_topic.php:28, tag secretmanager_create_secret_with_topic
• secretmanager/src/delete_regional_secret_expiration.php:28, tag secretmanager_delete_regional_secret_expiration
• secretmanager/src/delete_regional_secret_rotation.php:22, tag secretmanager_delete_regional_secret_rotation
• secretmanager/src/delete_regional_secret_using_etag.php:28, tag secretmanager_delete_regional_secret_using_etag
• secretmanager/src/delete_secret_expiration.php:28, tag secretmanager_delete_secret_expiration
• secretmanager/src/delete_secret_rotation.php:22, tag secretmanager_delete_secret_rotation
• secretmanager/src/delete_secret_using_etag.php:28, tag secretmanager_delete_secret_using_etag
• secretmanager/src/destroy_regional_secret_version_using_etag.php:28, tag secretmanager_destroy_regional_secret_version_using_etag
• secretmanager/src/destroy_secret_version_using_etag.php:28, tag secretmanager_destroy_secret_version_using_etag
• secretmanager/src/disable_regional_secret_version_using_etag.php:28, tag secretmanager_disable_regional_secret_version_using_etag
• secretmanager/src/disable_secret_version_using_etag.php:28, tag secretmanager_disable_secret_version_using_etag
• secretmanager/src/enable_regional_secret_version_using_etag.php:28, tag secretmanager_enable_regional_secret_version_using_etag
• secretmanager/src/enable_secret_version_using_etag.php:28, tag secretmanager_enable_secret_version_using_etag
• secretmanager/src/list_regional_secret_versions_with_filter.php:28, tag secretmanager_list_regional_secret_versions_with_filter
• secretmanager/src/list_regional_secrets_with_filter.php:28, tag secretmanager_list_regional_secrets_with_filter
• secretmanager/src/list_secret_versions_with_filter.php:28, tag secretmanager_list_secret_versions_with_filter
• secretmanager/src/list_secrets_with_filter.php:28, tag secretmanager_list_secrets_with_filter
• secretmanager/src/update_regional_secret_rotation.php:22, tag secretmanager_update_regional_secret_rotation
• secretmanager/src/update_regional_secret_using_etag.php:28, tag secretmanager_update_regional_secret_using_etag
• secretmanager/src/update_regional_secret_with_expiration.php:28, tag secretmanager_update_regional_secret_with_expiration
• secretmanager/src/update_secret_rotation.php:22, tag secretmanager_update_secret_rotation
• secretmanager/src/update_secret_using_etag.php:28, tag secretmanager_update_secret_using_etag
• secretmanager/src/update_secret_with_expiration.php:28, tag secretmanager_update_secret_with_expiration

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[gemini-code-assist]

Summary of Changes

Hello @dhavalbhensdadiya-crest, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Google Cloud Secret Manager PHP samples by introducing a wide array of new functionalities. It provides developers with practical examples for creating, updating, and managing secrets with advanced features such as time-to-live (TTL) expiration, customer-managed encryption keys (CMEK), and automated rotation policies. Furthermore, it includes samples demonstrating optimistic concurrency control using ETags for secret and secret version operations, and improved filtering capabilities for listing resources. These additions aim to streamline the development process for applications utilizing Secret Manager.

Highlights

• Expanded Secret Management Samples: Introduced new PHP samples for Google Cloud Secret Manager, demonstrating advanced features like secret expiration (TTL), customer-managed encryption keys (CMEK), and rotation policies.
• Comprehensive CRUD Operations: Provided samples for creating, updating, and deleting secrets with these new features, covering both global and regional configurations.
• Optimistic Concurrency with ETags: Added samples for managing secrets and secret versions using ETags to ensure optimistic concurrency during updates and deletions.
• Enhanced Filtering Capabilities: Included new samples for listing secrets and secret versions with filtering options.
• Updated Documentation and Tests: The README.md was updated with necessary environment variable configurations, and extensive unit tests were added to validate all new functionalities.

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive set of samples for Secret Manager's secret expiration and rotation features, covering both global and regional secrets. The additions include creating, updating, and removing these configurations, complete with corresponding tests. The code is well-organized and the changes are a valuable addition. I have identified a few minor areas for improvement concerning coding standards and a small error in the test files, which are detailed in the specific comments.