Batch find GitHub users by their email addresses. Returns a map of %{email => {:ok, user_info} | {:error, reason}}

@spec close_pull_request(pos_integer(), String.t() | nil) ::
  {:ok, String.t()} | {:error, String.t()}

Close the open pull request numbered number, commenting comment on it first when one is given.

@spec create_release(String.t(), String.t(), String.t()) ::
  {:ok, String.t()} | {:error, String.t()}

Create a GitHub release for an existing tag, returning its URL.

Find a GitHub user by their email address. Returns {:ok, user} if found, where user contains :username, :id, and :url. Returns {:error, reason} if not found or if there's an error.

@spec open_pull_request_number(String.t()) ::
  {:ok, pos_integer() | nil} | {:error, String.t()}

The number of the open pull request for branch, or nil when there is none.

@spec upsert_pull_request(String.t(), String.t(), String.t(), String.t(), [String.t()]) ::
  {:ok, String.t()} | {:error, String.t()}

Create or update the open pull request for branch, returning its URL.

labels are applied when the pull request is first created.