Basic Rails 6 Dockerfile

Dockerfile

FROM ruby:2.7

# Add the key of yarn repo
RUN curl -sS 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 -yqq

RUN apt-get install -yqq --no-install-recommends nodejs yarn

COPY . /usr/src/app

WORKDIR /usr/src/app

RUN bundle install && rails webpacker:install

CMD ["bin/rails", "s", "-b", "0.0.0.0"]