feat: Updated Flexible Mysql Module

[anmolnagpal]

Description

Fixes #

• Security hardening defaults and safer module behavior
• Documentation and examples alignment
• CI/validation adjustments where required

Closes #

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Type of Change

• Feature
• Feature (Breaking Change)
• Fix
• Fix (Breaking Change)
• CI/CD
• Documentation
• Other (please specify):

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Checklist

• I have reviewed open pull requests to avoid duplication of work
• All relevant pipelines or checks pass successfully
• I have added or updated documentation if applicable

[gemini-code-assist]

Summary of Changes

Hello @anmolnagpal, 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 security of the Flexible MySQL module by changing the default public network access to disabled. This change promotes a more secure-by-default configuration, reducing potential exposure. Users who previously relied on the more permissive defaults will need to explicitly configure public network access if required.

Highlights

• Security Default Change: The default value for the public_network_access variable has been changed from Enabled to Disabled to enhance the security posture of the MySQL Flexible Server module by default.
• Documentation Alignment: The README.md has been updated to reflect the new security defaults, including the removal of the public_network_access_enabled input and the addition of a new section explaining the hardening updates and their implications.
• Changelog Update: A new entry has been added to CHANGELOG.md under 'Unreleased' to document the security hardening updates, noting adjustments to defaults, examples, and documentation.

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Changelog

• CHANGELOG.md
  • Added an entry under 'Unreleased' for security hardening updates, noting adjustments to defaults, examples, and documentation.
• README.md
  • Removed the public_network_access_enabled input variable from the documentation table.
  • Updated the default value for public_network_access to Disabled in the input table.
  • Added a new section 'Security defaults updated (2026-02)' to inform users about the hardening updates and potential configuration adjustments.
• variables.tf
  • Modified the default value of the public_network_access variable from Enabled to Disabled.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/pr_checks.yml

Activity

• The pull request introduces security hardening updates to the Flexible MySQL module.
• Default public network access is now set to 'Disabled' for improved security.
• Documentation and changelog have been updated to reflect these security changes.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable security enhancement by changing the default for public_network_access to Disabled, making the module more secure out-of-the-box. The changes are well-executed across the board. The variables.tf file is correctly updated, and the README.md has been updated to reflect this new default, including a helpful note about the potential breaking change for users relying on the previous default. The changelog has also been updated. I also appreciate the documentation cleanup, such as removing the stale public_network_access_enabled variable. Overall, these are solid improvements to the module.

[anmolnagpal]

[gemini-followup-2026-02-09]
Reviewed Gemini feedback for this PR. Resolution: addressed/non-blocking for this branch. If PR-title CI fails, it's blocked by org-level workflow regex config (terraform-az-modules/.github#29), not module code.