Развертывание приложения ruby ​​на Dokku: почему конфигурация Bundler запускается без производства?

При использовании Dokku 0.5.3 у меня возникла проблема с развертыванием приложения Ruby / Rack: Bundler не устанавливает мои драгоценные камни в группу :production.

Вот мой Gemfile:

source 'https://rubygems.org'

ruby '2.3.0'

gem 'bundler'
gem 'sinatra'
gem 'sinatra-contrib'
gem 'json'
gem 'thin'
gem 'instagram'
gem 'data_mapper'
gem 'dm-types',
  :git => 'git://github.com/julienma/dm-types.git',
  :branch => 'gem-v1.2.2-with-frozen-nilclass-fix'

gem 'dm-postgres-adapter', :group => :production

group :development, :test do
  gem 'dm-sqlite-adapter'
  gem 'dotenv'
  gem 'pry'
end

Вот результат, когда я отправляю свое репо в dokku:

Counting objects: 114, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (91/91), done.
Writing objects: 100% (114/114), 13.76 KiB | 0 bytes/s, done.
Total 114 (delta 53), reused 0 (delta 0)
-----> Cleaning up...
-----> Building my-app from herokuish...
-----> Adding BUILD_ENV to build environment...
-----> Ruby app detected
-----> Compiling Ruby/Rack
-----> Using Ruby version: ruby-2.3.0
-----> Installing dependencies using bundler 1.11.2
       Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
       Fetching gem metadata from https://rubygems.org/.........
       Fetching version metadata from https://rubygems.org/...
       Fetching dependency metadata from https://rubygems.org/..
       Fetching git://github.com/julienma/dm-types.git
       Installing bcrypt 3.1.11 with native extensions
       Installing backports 3.6.8
       Installing addressable 2.4.0
       Installing daemons 1.2.3
       Using json 1.8.3
       Installing fastercsv 1.5.5
       Installing json_pure 1.8.3
       Installing multi_json 1.11.2
       Installing stringex 1.5.1
       Installing uuidtools 2.1.5
       Installing multipart-post 2.0.0
       Installing eventmachine 1.2.0.1 with native extensions
       Installing hashie 3.4.3
       Installing rack 1.6.4
       Installing tilt 2.0.2
       Using bundler 1.11.2
       Installing bcrypt-ruby 3.1.5
       Installing dm-core 1.2.1
       Installing faraday 0.9.2
       Installing rack-protection 1.5.3
       Installing rack-test 0.6.3
       Installing faraday_middleware 0.9.2
       Installing dm-aggregates 1.2.0
       Installing dm-constraints 1.2.0
       Installing dm-migrations 1.2.0
       Installing dm-serializer 1.2.2
       Installing dm-transactions 1.2.0
       Using dm-types 1.2.2 from git://github.com/julienma/dm-types.git (at gem-v1.2.2-with-frozen-nilclass-fix@b34937c)
       Installing dm-timestamps 1.2.0
       Installing dm-validations 1.2.0
       Installing sinatra 1.4.7
       Installing instagram 1.1.6
       Installing sinatra-contrib 1.4.6
       Installing data_mapper 1.2.0
       Installing thin 1.6.4 with native extensions
       Bundle complete! 12 Gemfile dependencies, 35 gems now installed.
       Gems in the groups development, test and production were not installed.
       Bundled gems are installed into ./vendor/bundle.
       Bundle completed (42.90s)
       Cleaning up the bundler cache.

---
       addons: []
       config_vars:
       LANG: en_US.UTF-8
       RACK_ENV: production
       default_process_types:
       rake: bundle exec rake
       console: bundle exec irb
       web: bundle exec thin start -R config.ru -e $RACK_ENV -p $PORT
-----> Discovering process types
       Procfile declares types -> web
-----> Releasing my-app (dokku/my-app:latest)...
-----> Deploying my-app (dokku/my-app:latest)...
-----> Attempting to run scripts.dokku.predeploy from app.json (if defined)
-----> App Procfile file found (/home/dokku/my-app/DOKKU_PROCFILE)
-----> DOKKU_SCALE file not found in app image. Generating one based on Procfile...
-----> New DOKKU_SCALE file generated
=====> web=1
-----> Running pre-flight checks
       For more efficient zero downtime deployments, create a file CHECKS.
       See http://dokku.viewdocs.io/dokku/checks-examples.md for examples
       CHECKS file not found in container: Running simple container check...
-----> Waiting for 10 seconds ...
remote: App container failed to start!!
=====> my-app web container output:
       /app/vendor/bundle/ruby/2.3.0/gems/backports-3.6.8/lib/backports/std_lib.rb:9:in `require': cannot load such file -- dm-postgres-adapter (LoadError)
        from /app/vendor/bundle/ruby/2.3.0/gems/backports-3.6.8/lib/backports/std_lib.rb:9:in `require_with_backports'
        from /app/vendor/bundle/ruby/2.3.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:163:in `load_adapter'
        from /app/vendor/bundle/ruby/2.3.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:133:in `adapter_class'
        from /app/vendor/bundle/ruby/2.3.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:13:in `new'
        from /app/vendor/bundle/ruby/2.3.0/gems/dm-core-1.2.1/lib/dm-core.rb:230:in `setup'
        from /app/controllers/app.rb:38:in `<top (required)>'
        from /app/config.ru:1:in `require'
        from /app/config.ru:1:in `block in <main>'
        from /app/vendor/bundle/ruby/2.3.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
        from /app/vendor/bundle/ruby/2.3.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
        from /app/config.ru:1:in `new'
        from /app/config.ru:1:in `<main>'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/rack/adapter/loader.rb:33:in `eval'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/rack/adapter/loader.rb:33:in `load'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/rack/adapter/loader.rb:42:in `for'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/thin/controllers/controller.rb:170:in `load_adapter'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/thin/controllers/controller.rb:74:in `start'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/thin/runner.rb:200:in `run_command'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/lib/thin/runner.rb:156:in `run!'
        from /app/vendor/bundle/ruby/2.3.0/gems/thin-1.6.4/bin/thin:6:in `<top (required)>'
        from /app/vendor/bundle/ruby/2.3.0/bin/thin:23:in `load'
        from /app/vendor/bundle/ruby/2.3.0/bin/thin:23:in `<main>'
       Using rack adapter
=====> end my-app web container output
To ssh://[email protected]:22/my-app
 ! [remote rejected] patch-dm-postgres-adapter-deploy -> master (pre-receive hook declined)
error: failed to push some refs to 'ssh://[email protected]:22/my-app'

Ошибка рубина связана с тем, что он не может требовать dm-postgres-adapter, потому что его гем не установлен. Bundler также заявляет, что Gems in the groups development, test and production were not installed..

Вот что я знаю:

• У меня есть местный .bundler/config, содержащий BUNDLE_WITHOUT: production, но это .gitignore'd.

• В экземпляре dokku это то, что дает мне dokku run my-app bundle config:

  Settings are listed in order of priority. The top value will be used.
  without
  Set for your local app (/app/.bundle/config): "development:test:production"
  Set via BUNDLE_WITHOUT: "development:test"
  Set for the current user (/app/.bundle/config): "development:test:production"
  ...
  

Я могу понять, откуда взялось development:test предложения without, но я действительно не понимаю, как и почему production также присутствует.

Я также попытался установить ENV var BUNDLE_WITHOUT: development:test перед развертыванием в первый раз. Он учитывается, однако ему предшествует конфигурация локального сборщика, которая уже исключает production.

Я решил это, вручную отредактировав /home/dokku/my-app/cache/.bundle/config и удалив production:

    BUNDLE_WITHOUT: development:test

После повторного нажатия Bundler успешно установил мой production gem.

Но я не хочу вручную редактировать файлы конфигурации на сервере, чтобы заставить его работать.

Итак, ВОПРОС:

• Почему production группа игнорируется Bundler при развертывании на Dokku?
• Как я могу принудительно установить production драгоценные камни?

Спасибо!