ci(kubernetes): add setup script and deploy manifests with k3d

[aadil96]

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[what-the-diff]

PR Summary

• Implement Configuration Set-Up for K3D Cluster: Introduced a k3d-config.yaml file which guides the establishment of a k3d cluster. It includes core settings such as a single server and agent while disabling Traefik.

• Craft Backend Component Deployment Manifest: With backend/deployment.yaml we have defined how the backend component of the application should be deployed. This sets up a single replica, puts memory limits in place, and opens container port 22112.

• Initiate Backend Component LoadBalancer Service: The backend/service.yaml provides instructions for setting up a LoadBalancer service that manages the backend component.

• Establish Frontend Component Deployment Manifest: The frontend/deployment.yaml file depicts how to deploy our frontend component while also setting an environment variable API_URL to link it to the backend.

• Set Up Frontend LoadBalancer Service: Via the frontend/service.yaml we've defined a LoadBalancer service that governs the behaviour of the frontend component.

• Incorporate Kustomization Files for Backend and Frontend: These files offer an efficient way of controlling the deployments and services of these two core components.

• Main Kustomization File Integration: This file is in the base and invites the resources of both the backend and frontend.

• Development Structures and Environment Adjustments: With the 'dev' namespace and kustomization files, both backend and frontend deployments are effectively structured and adapted to the development environment.

• Introduce Cluster Set-Up Script: The setup_cluster_local script presents an automated process for setting up a k3d cluster. Notable features include dependency checks, Docker image builds, application deployments, and error handling for service URL extraction.

• Update to mise.toml: The file now includes dependencies for k3d and kubectl, plus introduces a new task for setting up the Kubernetes cluster.