Add CD Terraform variables

[jonathanscholtes]

This pull request updates the deployment workflow to integrate Terraform for infrastructure management and to dynamically retrieve resource names from Terraform outputs. This makes the deployment process more robust and reduces reliance on manually managed secrets for resource names.

Infrastructure as Code and Environment Setup:

• Added environment variables for Azure authentication and enabled OIDC for secure authentication in the workflow (.github/workflows/deploy.yml).
• Integrated Terraform setup and initialization steps, including reading outputs for resource names such as resource group, container registry, app, and job (.github/workflows/deploy.yml).

Deployment Process Improvements:

• Updated build and deployment steps to use dynamically retrieved Terraform output values for resource names, replacing hardcoded secrets (.github/workflows/deploy.yml). [1] [2]
• Renamed deployment steps for clarity, such as "Update Container App" and "Update Load Generator Job" (.github/workflows/deploy.yml).