Setup k8s cluster with kind using different k8s releases

#!/bin/bash
#! /bin/bash
# This script sets up k8s cluster using metallb and istio
# Make sure you have the following executable in your path
#     kubectl
#     kind
#     istioctl

# Setup some colors
ColorOff='\033[0m'        # Text Reset
Black='\033[0;30m'        # Black
Red='\033[0;31m'          # Red
Green='\033[0;32m'        # Green

K8S_RELEASE=$1
# Get all the available releases
alltags=$(wget -q https://registry.hub.docker.com/v1/repositories/kindest/node/tags -O -  | sed -e 's/[][]//g' -e 's/"//g' -e 's/ //g' | tr '}' '\n'  | awk -F: '{print $3}')

rm -rf ~/.kube/*

if [ -z $K8S_RELEASE ]; then
  kind create cluster
else
  if [[ "$alltags" == *"$K8S_RELEASE"* ]]; then
    kind create cluster --image=kindest/node:$K8S_RELEASE
  else
    echo "Available k8s releases are $alltags"
    exit 1
  fi
fi

# The following procedure is to setup load balancer
kubectl cluster-info --context kind-kind

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/master/manifests/namespace.yaml
kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/master/manifests/metallb.yaml

PREFIX=$(docker network inspect -f '{{range .IPAM.Config }}{{ .Gateway }}{{end}}' kind | cut -d '.' -f1,2)

cat <