$ docker build --build-arg UID=$(id -u) --build-arg GID=$(id -g) -t rbs-playground .
$ docker run --rm --name playground -v .:/myapp -itd rbs-playground /bin/bash
# 型生成
$ docker exec -it playground bundle exec rbs prototype rb --out-dir=sig/prototype --base-dir=. app
# 型再生成
$ sh lib/clean.sh
# 型チェック
$ docker exec -it playground bundle exec steep check
# gemの型更新
$ docker exec -it playground bundle exec rbs collection update
$ docker exec -it playground bundle exec irb
irb(main):001:0>
# app/hello.rbを実行
$ docker exec -i playground bundle exec ruby app/hello.rb