Add container definition for k3d cluster

[kforeverisback]

Purpose

Create a container definition which provisions a local kubernetes cluster with k3d (for Codespaces and Remote - Containers).

Motivation

While we have a container definition to provision a k8s cluster with Minikube. k3d with k3s kubernetes distribution has several advantages over minikube for provisioning a local cluster:

• Faster cluster provision turnaround (create <--> delete).
  • With k3d, cluster creation and deletion are super-fast (under a minute).
  • Minikube takes couple of minutes to create or delete a cluster
• Faster inner-loop k8s cluster ready for use
• Lightweight, uses less memory and smaller binary size.
• It has built-in
  • Ingress Controller (traefik)
  • Replication Controller
  • Service Load Balancer
  • Can use existing docker network, docker registry as its internal registry
  • Local path provisioner
  • NodePort/Load-Balancer port forwarding
• See k3s page and k3d page for more features
• Examples of k3d as inner-loop k8s cluster: cse-labs/kubernetes-in-codespaces and cse-labs/istio-rust-webassembly-labs

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Relates to: Both: Codespaces and Remote - Containers