tsh ktsh aliases to use separate kube config file

ktsh-setup-example.sh

#> grep KUBECONFIG ~/.myzshrc
alias tsh='KUBECONFIG=~/.kube/tsh-config /opt/homebrew/bin/tsh'
alias ktsh='export KUBECONFIG=~/.kube/tsh-config'

#> grep -A2 -B1 k8s ~/.oh-my-zsh/themes/pure-thb.zsh-theme

        # show [k8s:<name>]
        part1=""
        if [[ "${KUBECONFIG:-}" != "" ]]; then
                kctx="$(grep current-context ${KUBECONFIG} | cut -d ' ' -f2)"
                part1="[%F{red}k8s%f:%F{cyan}$kctx%f] "
        fi