CircleCIで、RailsのRspecを実行したいが、rake db:createでエラーになる

Question

CircleCIで、bitbuketへのpush時に、テストを自動で行いたいのですが、
bundle ecec rake db:createコマンド実行時に
"NoMethodError: undefined method `[]' for nil:NilClass"
と、エラーが出てしまいます。

エラーを検索してみても、解決策が見つからず。どこに原因があるのかも見当がつきません、、、
どなたか見当がつく方がいらっしゃいましたら、ご教授お願いいたします。

発生しているエラー

#!/bin/bash -eo pipefail
bundle exec rake db:create
2019-11-19 06:48:28 WARN Selenium [DEPRECATION] Selenium::WebDriver::Chrome#driver_path= is deprecated. Use Selenium::WebDriver::Chrome::Service#driver_path= instead.
rake aborted!
NoMethodError: undefined method `[]' for nil:NilClass
/home/circleci/repo/config/initializers/devise.rb:20:in `block in <main>'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/devise-4.7.1/lib/devise.rb:311:in `setup'
/home/circleci/repo/config/initializers/devise.rb:5:in `<main>'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `load'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `load'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:285:in `block in load'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:285:in `load'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:657:in `block in load_config_initializer'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/notifications.rb:170:in `instrument'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:656:in `load_config_initializer'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:614:in `block (2 levels) in <class:Engine>'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:613:in `each'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/engine.rb:613:in `block in <class:Engine>'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `instance_exec'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:32:in `run'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:61:in `block in run_initializers'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:50:in `each'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:50:in `tsort_each_child'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/initializable.rb:60:in `run_initializers'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/application.rb:361:in `initialize!'
/home/circleci/repo/config/environment.rb:7:in `<main>'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `block in require'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:291:in `require'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/application.rb:337:in `require_environment!'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/railties-5.2.3/lib/rails/application.rb:520:in `block in run_tasks_blocks'
/home/circleci/repo/vendor/bundle/ruby/2.6.0/gems/rake-13.0.0/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `<main>'
Tasks: TOP => db:create => db:load_config => environment
(See full trace by running task with --trace)
Exited with code 1

コード

circleci/config.yml

version: 2
jobs:
  rubocop:
    docker:
      - image: circleci/ruby:2.6.2-node-browsers-legacy
        environment:
          RAILS_ENV: test
          POSTGRES_HOST: 127.0.0.1
      - image: circleci/postgres:11.5
        environment:
          POSTGRES_USER: postgres
          POSTGRES_DB: myapp_test
    working_directory: ~/repo
    steps:
      - checkout
      - restore_cache:
          keys:
            - v2-dependencies-{{ checksum "Gemfile.lock" }}
            # fallback to using the latest cache if no exact match is found
            - v2-dependencies-
      - run: bundle install --jobs=4 --retry=3 --path vendor/bundle
      - save_cache:
          paths:
            - ./vendor/bundle
          key: v2-dependencies-{{ checksum "Gemfile.lock" }}
      # Rubocop
      - run:
          name: Rubocop
          command: bundle exec rubocop --auto-correct

  rspec:
    docker:
      - image: circleci/ruby:2.6.2-node-browsers-legacy
        environment:
          RAILS_ENV: test
          POSTGRES_HOST: 127.0.0.1
      - image: circleci/postgres:11.5-alpine
        environment:
          POSTGRES_USER: postgres
          POSTGRES_DB: myapp_test
    working_directory: ~/repo
    steps:
      - checkout
      - restore_cache:
          keys:
            - v2-dependencies-{{ checksum "Gemfile.lock" }}
            - v2-dependencies- 
      - run:
          name: install bundle
          command: |
            bundle install --jobs=4 --retry=3 --path vendor/bundle
      - save_cache:
          paths:
            - ./vendor/bundle
          key: v2-dependencies-{{ checksum "Gemfile.lock" }}
      - run:
          name: データベースの起動を待機
          command: dockerize -wait tcp://127.0.0.1:5432 -timeout 1m

      #- run: mv config/database.yml.ci config/database.yml
      - run: bundle exec rake db:create
      
      - run:
          name: データベースのセットアップ
          command: bundle exec rake db:schema:load
      - run:
          name: gem install bundler
          command: gem install bundler
            # Align chrome-driver's version installed by chromedriver-helper
      - run: 
          name: rspecを実行
          command: bundle exec rspec
      - store_artifacts:
          path: tmp/screenshots/
          destination: capybara

workflows:
  version: 2
  rubocop_rspec:
    jobs:
      - rubocop
      - rspec:
          requires:
            - rubocop

database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  host: db
  username: postgres
  password:
  pool: 5

development:
  <<: *default
  database: myapp_development


test:
  <<: *default
  database: myapp_test

Answer 1

こちら、Dockerで開発していたのですが、hostを、コンテナのエイリアスであるdbで指定していたため、エラーが起きていたようです、
database.ymlを以下のように変更

(省略)
test:
  <<: *default
  host: <%= ENV.fetch("POSTGRES_HOST") { 'db' } %>
  database: myapp_test

このようにしたら、無事に、CIが通りました！