dockerコンテナ上でdocker-compose exec app rails consoleコマンドでrailsのコンソールを立ち上げようとしたところ、You must use Bundler 2 or greater with this lockfile.と出てしまったときの対処法。
[メモ]
docker-compose exec app gem install bundler
docker-compose exec app bundle install
以上。
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