circleCIのConfig Processing Error (Don't rerun) 0sエラー

お世話になっております。

現在、Docker環境にて、CiecleCIを学習中です。

https://qiita.com/AK4747471/items/b2161784065f21cd1645
上記のサイトを参考にしながら、バージョンを合わせたりしながら、構築をしているのですが、下記のエラーで止まってしまっています。

circlrCI上のエラー

#!/bin/sh -eo pipefail
# Unable to parse YAML
# while parsing a block mapping
#  in 'string', line 27, column 11:
#               name: install dependencies
#               ^
# expected <block end>, but found '<scalar>'
#  in 'string', line 30, column 13:
#                 gem install bundler -v 1.17.3
#                 ^
# 
# -------
# Warning: This configuration was auto-generated to show you the message above.
# Don't rerun this job. Rerunning will have no effect.
false

Exited with code exit status 1
CircleCI received exit code 1

インデントや記述ミスがあると仮説を立て、該当箇所を書き換えてみたもののエラー文は変わりませんでした。

config.yml

version: 2
jobs:
  build:
    docker:
      - image: circleci/ruby:2.5.3-node-browsers
        environment:
          - BUNDLER_VERSION: 1.17.3
          - RAILS_ENV: 'test'
      - image: circleci/mysql:5.6.49
        environment:
          - MYSQL_ALLOW_EMPTY_PASSWORD: 'true'
          - MYSQL_ROOT_HOST: '%'
          
    working_directory: ~/repo

    steps:
      - checkout

      # Download and cache dependencies
      - restore_cache:
          keys:
            - v1-dependencies-{{ checksum "Gemfile.lock" }}
            # fallback to using the latest cache if no exact match is found
            - v1-dependencies-

      - run:
          name: install dependencies
          command: |
            gem install bundler -v 1.17.3
            bundle install --jobs=4 --retry=3 --path vendor/bundle

      - save_cache:
          paths:
            - ./vendor/bundle
          key: v1-dependencies-{{ checksum "Gemfile.lock" }}

# ②ちょっと無理やりですが、database.ymlとdatabase.yml.ciを入れ替える記述です。
      - run: mv config/database.yml.ci config/database.yml 

      # Database setup
      - run: bundle exec rake db:create
      - run: bundle exec rake db:schema:load

# rubocopを走らせる記述です。
      - run:
          name: Rubocop
          command: bundle exec rubocop

# rspecを走らせる記述です。
      # run tests!
      - run:
          name: run tests
          command: |
            mkdir /tmp/test-results
            TEST_FILES="$(circleci tests glob "spec/**/*_spec.rb" | \
              circleci tests split --split-by=timings)"


            bundle exec rspec \
              --format progress \
              --format RspecJunitFormatter \
              --out /tmp/test-results/rspec.xml \
              --format progress \
              $TEST_FILES

      # collect reports
      - store_test_results:
          path: /tmp/test-results
      - store_artifacts:
          path: /tmp/test-results
          destination: test-results

エラーの27,30行目は下記に該当します。
circleci.yml

- run:
          name: install dependencies
          command: |
            gem install bundler -v 1.17.3
            bundle install --jobs=4 --retry=3 --path vendor/bundle

database.yml.ci

test:
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: 'root'
  port: 3306
  host: '127.0.0.1'
  database: _test

docker-compose .yml

version: '3'
services:
  db:
    image: mysql:5.6.49
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: root
    ports:
      - "4306:3306"

  web:
    build: .
    command: /bin/sh -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/app_name
    ports:
      - "3000:3000"
    links:
      - db

database.yml

# MySQL. Versions 5.1.10 and up are supported.
#
# Install the MySQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   https://dev.mysql.com/doc/refman/5.7/en/password-hashing.html
#
default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: password # docker-compose.ymlのMYSQL_ROOT_PASSWORD
  host: db # docker-compose.ymlのservice名

development:
  <<: *default
  database: app_name_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: app_name_test

# As with config/secrets.yml, you never want to store sensitive information,
# like your database password, in your source code. If your source code is
# ever seen by anyone, they now have access to your database.
#
# Instead, provide the password as a unix environment variable when you boot
# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
# for a full rundown on how to provide these environment variables in a
# production deployment.
#
# On Heroku and other platform providers, you may have a full connection URL
# available as an environment variable. For example:
#
#   DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase"
#
# You can use this database configuration with:
#
#   production:
#     url: <%= ENV['DATABASE_URL'] %>
#
production:
  <<: *default
  database: app_name_production
  username: app_name
  password: <%= ENV['APP_NAME_DATABASE_PASSWORD'] %>

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