Added samples for secret rotations - create, update, delete

[dhavalbhensdadiya-crest]

Description

Added samples for below operations in global and regional scope:

1. Create secret with rotation
2. Update secret with rotation
3. Remove rotation from secret
4. Create secret with topic

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• These samples need a new API enabled in testing projects to pass (let us know which ones) (Pub/Sub API)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones) (GOOGLE_CLOUD_PUBSUB_TOPIC)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 24 region tags.

• secretmanager/src/main/java/secretmanager/BindSecretTag.java:19, tag secretmanager_bind_secret_tag
• secretmanager/src/main/java/secretmanager/CreateSecretWithCmek.java:19, tag secretmanager_create_secret_with_cmek
• secretmanager/src/main/java/secretmanager/CreateSecretWithExpiration.java:19, tag secretmanager_create_secret_with_expiration
• secretmanager/src/main/java/secretmanager/CreateSecretWithRotation.java:19, tag secretmanager_create_secret_with_rotation
• secretmanager/src/main/java/secretmanager/CreateSecretWithTopic.java:19, tag secretmanager_create_secret_with_topic
• secretmanager/src/main/java/secretmanager/DeleteSecretAnnotations.java:19, tag secretmanager_delete_secret_annotations
• secretmanager/src/main/java/secretmanager/DeleteSecretExpiration.java:19, tag secretmanager_delete_secret_expiration
• secretmanager/src/main/java/secretmanager/DeleteSecretRotation.java:19, tag secretmanager_delete_secret_rotation
• secretmanager/src/main/java/secretmanager/DeleteSecretTag.java:19, tag secretmanager_delete_secret_tag
• secretmanager/src/main/java/secretmanager/ListSecretTagBindings.java:19, tag secretmanager_list_secret_tag_bindings
• secretmanager/src/main/java/secretmanager/UpdateSecretExpiration.java:19, tag secretmanager_update_secret_expiration
• secretmanager/src/main/java/secretmanager/UpdateSecretRotation.java:19, tag secretmanager_update_secret_rotation
• secretmanager/src/main/java/secretmanager/regionalsamples/BindRegionalSecretTag.java:19, tag secretmanager_bind_regional_secret_tag
• secretmanager/src/main/java/secretmanager/regionalsamples/CreateRegionalSecretWithCmek.java:19, tag secretmanager_create_regional_secret_with_cmek
• secretmanager/src/main/java/secretmanager/regionalsamples/CreateRegionalSecretWithExpiration.java:19, tag secretmanager_create_regional_secret_with_expiration
• secretmanager/src/main/java/secretmanager/regionalsamples/CreateRegionalSecretWithRotation.java:19, tag secretmanager_create_regional_secret_with_rotation
• secretmanager/src/main/java/secretmanager/regionalsamples/CreateRegionalSecretWithTopic.java:19, tag secretmanager_create_regional_secret_with_topic
• secretmanager/src/main/java/secretmanager/regionalsamples/DeleteRegionalSecretAnnotations.java:19, tag secretmanager_delete_regional_secret_annotations
• secretmanager/src/main/java/secretmanager/regionalsamples/DeleteRegionalSecretExpiration.java:19, tag secretmanager_delete_regional_secret_expiration
• secretmanager/src/main/java/secretmanager/regionalsamples/DeleteRegionalSecretRotation.java:19, tag secretmanager_delete_regional_secret_rotation
• secretmanager/src/main/java/secretmanager/regionalsamples/DeleteRegionalSecretTag.java:19, tag secretmanager_delete_regional_secret_tag
• secretmanager/src/main/java/secretmanager/regionalsamples/ListRegionalSecretTagBindings.java:19, tag secretmanager_list_regional_secret_tag_bindings
• secretmanager/src/main/java/secretmanager/regionalsamples/UpdateRegionalSecretExpiration.java:19, tag secretmanager_update_regional_secret_expiration
• secretmanager/src/main/java/secretmanager/regionalsamples/UpdateRegionalSecretRotation.java:19, tag secretmanager_update_regional_secret_rotation

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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 expands the Google Cloud Secret Manager Java samples by introducing a suite of new examples for advanced secret management features. It provides clear, executable code for creating secrets with rotation policies, expiration times, customer-managed encryption keys (CMEK), and Pub/Sub topic notifications. Additionally, it includes samples for managing resource tags associated with secrets. These additions are available for both global and regional Secret Manager instances, enhancing the utility and completeness of the sample library for developers.

Highlights

• Secret Rotation Samples: New samples demonstrating how to create, update, and remove rotation policies for secrets, including setting next rotation times and periods.
• Secret Expiration Samples: Added samples for creating secrets with a defined expiration time and for updating or deleting this expiration policy.
• CMEK Integration Samples: Introduced samples for creating secrets encrypted with Customer-Managed Encryption Keys (CMEK).
• Pub/Sub Topic Samples: New samples for associating Pub/Sub topics with secrets for notification purposes during creation and updates.
• Secret Tag Management Samples: Samples for binding, listing, and deleting resource tags on secrets.
• Global and Regional Scope Coverage: All new functionalities are provided with distinct samples for both global and regional Secret Manager configurations.
• Documentation Updates: The README.md has been updated to include necessary environment variables (KMS keys, Pub/Sub topic) and IAM permissions for running the new samples.
• Comprehensive Testing: Corresponding integration tests have been added or updated to validate the functionality of all new samples.

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[gemini-code-assist]

Code Review

This pull request adds a comprehensive set of new samples for Google Cloud Secret Manager, focusing on secret rotation, expiration, CMEK, topics, and tags for both global and regional secrets. The changes include new Java sample files, corresponding integration tests, and updates to the README with necessary setup instructions. The code is well-structured and the new samples are valuable additions. I have one suggestion to improve the clarity of the setup instructions in the README file.

[gemini-code-assist]

The comment (region same as location) is a bit ambiguous and could lead to confusion. To improve clarity for users, it would be better to be more explicit about which location this refers to. For instance, you could clarify that it's the location used for regional secret samples.

Suggested change

	$ export GOOGLE_CLOUD_REGIONAL_KMS_KEY=<full-name-of-regional-kms-key> (region same as location)
	$ export GOOGLE_CLOUD_REGIONAL_KMS_KEY=<full-name-of-regional-kms-key> (region must match the location of regional secrets)