[ADE-11] Add GitHub Actions workflows for automated deployments

[GuidoBR]

Change

Add automated deployment pipelines for staging and production environments
using GitHub Actions. Set up AWS infrastructure with CDK and configure
secure role-based authentication.

Key Changes:

• Add GitHub Actions workflows for staging and production deployments
• Configure environment-specific CDK stack deployments
• Set up test jobs to run before deployments
• Use AWS IAM role for secure authentication
• Update Dockerfile with environment support
• Add environment variable handling for different stages

Infrastructure:

• Configure ECS Fargate service with environment-specific settings
• Set up API Gateway integration
• Configure environment-specific secrets paths
• Add CDK infrastructure tests

Testing:

• Add test jobs as deployment prerequisites
• Run unit tests with Vitest
• Run CDK infrastructure tests
• Ensure tests must pass before deployment

Security:

• Use role-based authentication with AWS
• Configure environment-specific permissions
• Remove hardcoded credentials
• Use environment-specific secret paths

This change enables automated deployments while maintaining security
and environment separation.