Support this config flags

The following are options present for the GitHub runner during installation.
Might not be needed.

```
Config Options:
--unattended Disable interactive prompts for missing arguments. Defaults will be used for missing options
--url string Repository to add the runner to. Required if unattended
--token string Registration token. Required if unattended
--name string Name of the runner to configure (default ip-172-31-40-46)
--runnergroup string Name of the runner group to add this runner to (defaults to the default runner group)
--labels string Custom labels that will be added to the runner. This option is mandatory if --no-default-labels is used.
--no-default-labels Disables adding the default labels: 'self-hosted,Linux,X64'
--local Removes the runner config files from your local machine. Used as an option to the remove command
--work string Relative runner work directory (default _work)
--replace Replace any existing runner with the same name (default false)
--pat GitHub personal access token with repo scope. Used for checking network connectivity when executing `./run.sh --check`
--disableupdate Disable self-hosted runner automatic update to the latest released version`
--ephemeral Configure the runner to only take one job and then let the service un-configure the runner after the job finishes (default false)

```

まず、このリポジトリで runner のインストールおよび設定のエントリポイントを見つけ、受け付けるオプションを一覧にある GitHub runner flags と比較します。対象となるオプションを判断し、選択した flags がインストール時に正しく引き渡されることを確認します。

索引モデルが issue の本文から書いたものです。