maybe a bit more universal way of setting root directory

kind/create.sh

@@ -1,6 +1,7 @@
-SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd)
-ROOT=$(realpath "$SCRIPT_DIR/..")
 set -e
+cd "$(dirname -- "$0")" || exit
+SCRIPT_DIR="$(pwd -P)"
+ROOT="$(realpath "$SCRIPT_DIR/..")"
 kind create cluster --config "$SCRIPT_DIR/config.yaml"
 kubectl apply --server-side -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.4.0/standard-install.yaml
 kubectl apply -f "$SCRIPT_DIR/manifests"