Dramatically speed up slow bundle install in docker environment

Purpose

I want to speed up bundle install time with newsdict.io (rails on docker environment)

Method

--Put the heaviest gem that doesn't change much in the base docker image so that you can use the gem. --Since I was using nokogiri, I use [--use-system-libraries] --Run bundle install in parallel

Actual code

--Put the heaviest gem that doesn't change much in the base docker image so that you can use the gem.

https://github.com/newsdict/docker_rails/blob/master/Dockerfile#L70

--Docker image used as a base

https://hub.docker.com/repository/docker/newsdict/rails

--Since I was using nokogiri, I use [--use-system-libraries]

https://github.com/yubele/newsdict.io/blob/9747c9a4d0a69f8f251f1deb9d6b776856281a2b/Dockerfile#L25

--Run bundle install in parallel

https://github.com/yubele/newsdict.io/blob/9747c9a4d0a69f8f251f1deb9d6b776856281a2b/Dockerfile#L24

Q&A

Shouldn't the result of bundle install be a docker image?

Because the Gemfile may be rewritten frequently

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