Docker 未使用の volume を一括で削除する

## 問題
sql のダンプファイル読み込んでいたら、こんなエラーでた。
```sh
ERROR:  could not extend file "base/16388/2128530": No space left on device
HINT:  Check free disk space.
```

## 解決
以下コマンドで未使用なボリュームを削除できる。
```sh
docker volume prune
```

実行したら、たくさん消えた。
```
WARNING! This will remove all local volumes not used by at least one container.
Are you sure you want to continue? [y/N] y
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