Feat/auto module tagging

[Sunny-Mor]

what

• Implemented shared GitHub Actions workflow for automated Terraform module semantic version tagging in a monorepo.
• Added caller workflow to invoke the shared workflow from any repo/module.
• Detects changed Terraform modules automatically on PR merge to the default branch.
• Reads semantic version bump (major, minor, patch) from PR commit message labels.
• Generates new tags without v prefix (e.g., vpc/1.1.0).
• Updates CHANGELOG.md automatically with PR title and new version.

why

• Centralize the Terraform module release process inside a monorepo.
• Avoid manual tagging and human errors in versioning.
• Ensure consistent semantic versioning across all Terraform modules.
• Make releases deterministic and triggered only when relevant Terraform module changes are merged.
• Reduce repetitive workflow code in multiple repos by reusing a shared workflow.