Nov 2025 Quality & Maintainability Improvements

[thathaneydude]

Description

This commit adds a complete testing framework and significantly improves
the module's maintainability, documentation, and CI/CD capabilities.

Testing Framework

• Add 24 comprehensive unit tests across 6 test files
  • basic_configuration.tftest.hcl (3 tests)
  • fleet_manager.tftest.hcl (3 tests)
  • feature_flags.tftest.hcl (5 tests)
  • output_encoding.tftest.hcl (5 tests)
  • validation.tftest.hcl (6 tests)
  • integration.tftest.hcl (2 tests)
• All tests pass with 100% success rate
• Tests cover all module functionality, edge cases, and validation rules

CI/CD Enhancements

• Add .github/workflows/test.yml for automated test execution
• Update .github/workflows/fmt-check.yml to include test step
• Add test commands to Taskfile.yml (test, test:verbose)
• Workflows run on PRs and main branch commits

Module Improvements

• Add versions.tf with provider version constraints
• Fix variable validation in variables.tf (move CIDR validation)
• Remove sensitive markers from variables (config generation use case)
• Add description to cloudinit_config output
• Remove example files (to be replaced with better examples later)

Documentation

• Completely rewrite README.md with production-ready documentation
• Add CI/CD status badges at top
• Add comprehensive sections: Features, Requirements, Testing, CI/CD
• Add Best Practices section with security considerations
• Add Troubleshooting guide and health check examples
• Add module structure diagram and architectural decisions
• Add Contributing and Support sections
• Improve all variable descriptions with examples
• Add HTML anchor links for all inputs/outputs

Quality Improvements

• Input validation ensures Fleet variables used together
• CIDR validation for subnetwork_monitoring_cidr
• All code formatted with terraform fmt
• Ready for production use

Type of change

Please delete options that are not relevant.

• Bug Fix
• New Feature
• This change requires a documentation update

How Has This Been Tested?

Describe the tests that you ran to verify your changes. Provide instructions so they can be
reproduced. Please also list any relevant details for your test configuration