feat(azure): implement Azure Container Instances operations

[hariram4862]

Note: This PR builds on top of the Azure networking and VM implementation (#48) and the VM Scale Set implementation (#50).
Once those PRs are merged, this PR will only contain the Azure Container Instances changes.

Closes #51

Summary

This PR adds support for Azure Container Instances in RustCloud.

Azure Container Instances allow users to run containers without managing virtual machines or orchestrators. This feature extends RustCloud's Azure compute capabilities by enabling lightweight container-based workloads alongside the existing Azure Virtual Machine and VM Scale Set support.

Implemented Services

• Azure Container Instances

Implemented Operations

• Create Container Group
• List Container Groups
• Get Container Group
• Restart Container Group
• Delete Container Group

Methodology

Azure Container Instance resources are managed using the Azure REST API.
Authentication is handled using Azure CLI, where access tokens are retrieved from the Azure CLI session and used to authorize requests to Azure resource management APIs.

Before running tests, login using Azure CLI:

az login

Set the subscription ID as an environment variable.

Linux/macOS:

export AZURE_SUBSCRIPTION_ID=<subscription-id>

Windows PowerShell:

$env:AZURE_SUBSCRIPTION_ID="<subscription-id>"

Running Tests

cargo test test_create_container_group -- --nocapture
cargo test test_list_container_groups -- --nocapture
cargo test test_get_container_group -- --nocapture
cargo test test_restart_container_group -- --nocapture
cargo test test_delete_container_group -- --nocapture

Notes

Tests assume the Azure account has sufficient permissions to create resources.