1.docker-compose build
2.docker-compose run --rm app bundle install
3.docker-compose run --rm app bundle exec rails new . -f -B -d postgresql
4.docker-compose run --rm app bundle install
5.docker-compose run --rm app bundle exec rails webpacker:install
6.database.ymlの編集
7.docker-compose up
8.ブラウザでhttp://localhost