[Helm Chart] Google Subnet

[smileisak]

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As a [Platform Engineer], I want to create/update a Helm chart for creating Google Subnets via Config Connector, so that I can define network ranges in a consistent manner.

Table of content
[[TOC]]

Details

• Depends on VPC creation or references an existing VPC.
• Manages subnet parameters like region, IP range, secondary ranges, etc.

Acceptance criteria

• Dependencies updated.
• Comprehensive README.md with usage, including sample values.
• Out-of-the-box example (e.g., creating a subnet in a specified region).
• At least one placeholder for a Prometheus rule (if network-related metrics apply).
• Semantic Versioning in place.
• All quality gates pass.

Definition of Ready

• Detailed summary and acceptance criteria.
• Clear instructions on referencing an existing VPC or creating a new one.
• Gating checks pass.

Definition of Production Ready

• Chart published in an OCI/Helm repo.
• Default values for typical production subnets.
• Pluto or other testing to verify compatibility.
• Breaking changes or critical notes documented.

Process Release of the Chart

• Each MR references the Issue.
• Pipeline tests pass (lint, template checks).
• Chart version bumped, release notes updated, merged after approval.

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