fixed cluster failure creation for existing cluster

[eedygreen]

The Error

ERROR: failed to create cluster: node(s) already exist for a cluster with the name "kind"

For an existing cluster, the script in the setup/00-intro.sh will fail.
This command kind create cluster --config kind.yaml will exit if there is an existing cluster.

As a result of it early exit, it cause failure to the rests of the command here

The Fix

kind get clusters | grep -q "kind" || kind create cluster --config kind.yaml

[vfarcic]

I'm afraid that if the cluster is already running, whatever is in that cluster might interfere with the setup. I feel it's safer to remove the cluster and create a new one. What do you think? If you agree, the change to the script might need to be to check for the existence of the cluster and, if it's found, an input asking a user to confirm that it's okay to delete it.