Add comprehensive ARM templates for Azure Container Registry and infrastructure

[Copilot]

This PR implements comprehensive Azure Resource Manager (ARM) templates for deploying Azure Container Registry and supporting infrastructure for the netcore-microservice-tutorial project.

What's Added

Core ARM Templates

• acr-template.json - Dedicated Azure Container Registry template with configurable SKU tiers (Basic/Standard/Premium)
• main-template.json - Complete infrastructure template including ACR, App Service Plan, Log Analytics workspace, and Storage Account
• Parameter files for both templates with sensible defaults and customization options

Deployment Automation

• Cross-platform deployment scripts - Both Bash (Linux/macOS) and PowerShell (Windows) scripts for automated deployment
• Template validation script - Pre-deployment validation to catch errors early
• Error handling and user prompts - Automatic resource group creation and comprehensive error checking

CI/CD Integration

• GitHub Actions workflows for infrastructure deployment and Docker image builds
• Multi-service build pipeline that builds and pushes API, SPA, and HA-Proxy images to ACR
• Manual deployment triggers with configurable parameters

Documentation

• Comprehensive README in the azure-templates/ directory with usage examples
• Updated main README with infrastructure deployment instructions
• Clear parameter documentation and deployment examples

Key Features

The ARM templates support:

• Multiple ACR SKU tiers with appropriate defaults
• Optional infrastructure components (can enable/disable App Service Plan, Log Analytics)
• Resource tagging for better organization and cost tracking
• Secure defaults with HTTPS-only storage and proper network configurations
• Unique naming with automatic suffix generation to avoid conflicts

Usage Examples

Deploy just the Azure Container Registry:

cd azure-templates
./deploy-acr.sh my-resource-group

Deploy complete infrastructure:

cd azure-templates
./deploy-infrastructure.sh my-resource-group

Validate templates before deployment:

cd azure-templates
./validate-templates.sh

This implementation fulfills the roadmap items mentioned in the README for "Docker swarm automation template (Azure RM templates)" and "Azure Container registry", providing a complete infrastructure-as-code solution for the microservice deployment pipeline.

Fixes #2.

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