Error: Failed to add dockerfile-rails gem, exiting: signal: killed

I have a question please.
Prerequisite: rails 5.1.6
I am working on deploying my personal portfolio.
What I would like to achieve
I am getting an attachment error. I would like to understand and resolve what this error means.
What we have tried
I googled and asked chat gpt.
Attached is the gem file. Please give me some hints. Thank you in advance for your help.


source ''

git_source(:github) do |repo_name|

repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")



# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'

gem 'rails', '~> 5.1.6'

# Use sqlite3 as the database for Active Record

gem 'sqlite3'

# Use Puma as the app server

gem 'puma', '~> 3.7'

# Use SCSS for stylesheets

gem 'sass-rails', '~> 5.0'

# Use Uglifier as compressor for JavaScript assets

gem 'uglifier', '>= 1.3.0'

# See for more supported runtimes

# gem 'therubyracer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views

gem 'coffee-rails', '~> 4.2'

# Turbolinks makes navigating your web application faster. Read more:

gem 'turbolinks', '~> 5'

# Build JSON APIs with ease. Read more:

gem 'jbuilder', '~> 2.5'

# Use Redis adapter to run Action Cable in production

# gem 'redis', '~> 4.0'

# Use ActiveModel has_secure_password

# gem 'bcrypt', '~> 3.1.7'

# Use Capistrano for deployment

# gem 'capistrano-rails', group: :development

group :development, :test do

# Call 'byebug' anywhere in the code to stop execution and get a debugger console

gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]

# Adds support for Capybara system testing and selenium driver

gem 'capybara', '~> 2.13'

gem 'selenium-webdriver'


group :development do

# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.

gem 'web-console', '>= 3.3.0'

gem 'listen', '>= 3.0.5', '< 3.2'

# Spring speeds up development by keeping your application running in the background. Read more:

gem 'spring'

gem 'spring-watcher-listen', '~> 2.0.0'


# Windows does not include zoneinfo files, so bundle the tzinfo-data gem

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
group :production do
  gem 'pg', '0.20.0'


Error: release command failed - aborting deployment. error running release_command machine: error creating a release_command machine: failed to launch VM: no capacity available in nrt or paste code here


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