pulumi-bin: allows to use gh account for update instead of GITHUB_TOKEN

# shellcheck shell=bash

# Bash 3 compatible for Darwin

if ! gh auth status --hostname github.com >/dev/null 2>&1; then

  if [ -z "${GITHUB_TOKEN}" ] || [ $# -ne 1 ]; then

    echo >&2 "Login to github.com with gh or provide GITHUB_TOKEN env"

    echo >&2 "usage: GITHUB_TOKEN=… ./update.sh pulumi-version"

    exit 1

  fi

fi

SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )