Create Variables Template Infrastructure

[josecelano]

Parent Epic: #19 - Refactor Ansible Templates to Variables Pattern

Overview

Create the centralized variables.yml.tera template and supporting Rust infrastructure (context, wrapper, renderer) to consolidate Ansible playbook variables into a single file. This establishes the foundation for the variables pattern that will simplify future playbook additions.

Goals

• Variables Template: Create templates/ansible/variables.yml.tera with system configuration variables
• Context Layer: Implement AnsibleVariablesContext with validation
• Wrapper Layer: Implement AnsibleVariablesTemplate for rendering
• Renderer Layer: Implement VariablesTemplateRenderer for orchestration
• Integration: Hook into AnsibleTemplateRenderer::render() workflow
• Test Coverage: Comprehensive unit tests for all components

🏗️ Architecture Requirements

DDD Layer: Infrastructure
Module Path: src/infrastructure/external_tools/ansible/template/
Pattern: Template Wrapper + Context + Renderer (existing pattern)

Time Estimate

2.5 days - Complete vertical slice including implementation, testing, and documentation

Documentation

Full implementation details: docs/issues/19.1-create-variables-template.md

Acceptance Criteria

Template File

• templates/ansible/variables.yml.tera exists with SSH port variable
• Template has correct Tera syntax: {{ ssh_port }}
• YAML linting passes

Implementation

• AnsibleVariablesContext with SSH port validation
• AnsibleVariablesTemplate wrapper implementation
• VariablesTemplateRenderer orchestrator
• Integration into AnsibleTemplateRenderer

Testing

• Unit tests pass: cargo test
• Config tests pass: cargo run --bin e2e-config-tests
• Linters pass: cargo run --bin linter all
• variables.yml generated in build directory

Documentation

• Rustdoc comments for all public types
• Template file includes descriptive comments
• Error types have clear descriptions

Related

• Parent Epic: EPIC: Refactor Ansible Templates to Variables Pattern #19
• Next Task: EPIC: Refactor Ansible Templates to Variables Pattern #19.2 (depends on this task)
• Template System Architecture