[RUBY] Install yarn in docker image


When deploying a Rails application (v5.2.4) created using Docker to a production environment, when I tried to precompile the assets, I got the following error and could not execute it.

$docker-compose run web bundle exec rake assets:precompile RAILS_ENV=production
Starting excite-map_db_1 ... done
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/instal

How to solve

Add the following to the Dockerfile

RUN curl https://deb.nodesource.com/setup_12.x | bash
RUN curl https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list

RUN apt-get update && apt-get install -y nodejs yarn postgresql-client



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