how to get github discussions categoryId

[liushooter]

gh api graphql -f query='
{
  # https://github.com/github/docs

  repository(owner: "github", name: "docs") {
    id # RepositoryID
    name
    discussionCategories(first: 10) {
      nodes {
        id # CategoryID
        name
      }
    }
  }
}'