Merge queue test

[hqpho]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @hqpho, 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 establishes a robust control mechanism for deploying feature flag changes, particularly for production environments. It introduces a new CI/CD step that leverages a bash script to enforce time-based restrictions, ensuring that critical production feature flag modifications can only be merged during designated business hours and weekdays. Additionally, it initializes environment-specific feature flag configurations, enabling a new V3 feature across various deployment stages with tailored mirror fractions.

Highlights

• Merge Restrictions CI/CD Integration: A new Cloud Build configuration (cloudbuild.merge_test.yaml) has been added to integrate a merge restriction script into the CI/CD pipeline, specifically designed for merge queue events.
• Production Feature Flag Guardrails: A new bash script (enforce_merge_restrictions.sh) has been implemented to prevent changes to production feature flag files from being merged outside of specific business hours (9 AM - 5 PM PT) and days (Monday - Thursday), enhancing deployment safety.
• Environment-Specific Feature Flag Configurations: New YAML configuration files have been created for autopush, dev, prod, and staging environments. These files all enable a V3 feature and set different V3MirrorFraction values tailored to each environment.

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[gemini-code-assist]

Code Review

This pull request introduces a new CI check to enforce restrictions on merging changes to production feature flags. The changes include a Cloud Build configuration and a bash script to perform the checks, along with several new feature flag configuration files. My review has identified a few critical issues in the implementation that will prevent the CI check from working as intended. Specifically, the script is called incorrectly in the Cloud Build config, and the script uses incorrect exit codes for success paths, which would cause the build to fail when it should pass. I've provided suggestions to fix these issues.

[gemini-code-assist]

The enforce_merge_restrictions.sh script is called without the required <config_dir> argument. The script's usage indicates it expects a directory path to scan for feature flag files. Based on the project structure, it seems deploy/featureflags should be passed as the argument.

        ./deploy/featureflags/enforce_merge_restrictions.sh deploy/featureflags

[gemini-code-assist]

The script exits with status 1, which indicates failure. However, this path is taken when no production files are modified, which is a successful outcome for this check. The script should exit with status 0 to indicate success.

Suggested change

	exit 1
	exit 0

[gemini-code-assist]

The script exits with status 1, which indicates failure. This path is taken when a production change is within the allowed time window, which is a successful outcome. The script should exit with status 0 to indicate success and allow the merge to proceed.

Suggested change

	exit 1
	exit 0

[gemini-code-assist]

For improved robustness, it's a good practice to validate that required environment variables like _BASE_REF are present at the start of the script. This provides a clearer error if the script is run in an unexpected environment where the variable is not set.

Suggested change

	set -e
	set -e
	if [[ -z "${_BASE_REF}" ]]; then
	echo "Error: _BASE_REF is not set. This script is intended to be run in a Google Cloud Build merge trigger." >&2
	exit 1
	fi