add_KUBECONFIG_if_exists () {
  if [[ -f "$1" ]]; then
    local local_config
    local_config="$(mktemp)"
    cp "${1}" "${local_config}"

    kubeconfig_random="$(od -vAn -N4 -tx /dev/random | tr -d '[:space:]' | cut -c1-8)"
    container_kubeconfig+="/config/${kubeconfig_random}:"
    CONDITIONAL_HOST_MOUNTS+="--mount type=bind,source=${local_config},destination=/config/${kubeconfig_random} "
  fi
}

  fi

    # If config not explicitly set, then use defaults
  if [[ -z "${CONFIG}" ]]; then
    # Kubernetes 1.15+
    CONFIG=${DEFAULT_CLUSTER_YAML}
  fi

  # Configure the cluster IP Family if explicitly set
  if [ "${IP_FAMILY}" != "ipv4" ]; then
    grep "ipFamily: ${IP_FAMILY}" "${CONFIG}" || \
    cat <<EOF >> "${CONFIG}"
networking:
  ipFamily: ${IP_FAMILY}
EOF
  fi

fi

echo "# Generated with \`kubectl kustomize \"https://github.com/kubernetes-sigs/gateway-api/config/crd/experimental?ref=${GATEWAY_VERSION}\"\`" > "${API_TMP}/gateway-api-crd.yaml"
if ! kubectl kustomize "github.com/kubernetes-sigs/gateway-api/config/crd/experimental?ref=${GATEWAY_VERSION}" >> "${API_TMP}/gateway-api-crd.yaml"; then