Dockerfile

# Dockerfile.production
FROM ruby:2.7
MAINTAINER hello@cloud66.com

ENV NODE_ENV production
ENV RAILS_ENV production

# NOTE: Uncomment to run as non-root user (part #1)
#ENV USER_NAME user
#ENV USER_ID 2917
#RUN addgroup --gid $USER_ID $USER_NAME
#RUN adduser --disabled-password --gecos '' --uid $USER_ID --gid $USER_ID $USER_NAME

RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg -o /root/yarn-pubkey.gpg && apt-key add /root/yarn-pubkey.gpg
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y --no-install-recommends nodejs yarn

ENV INSTALL_PATH /app
RUN mkdir -p $INSTALL_PATH
WORKDIR $INSTALL_PATH

# ensure bundler is present
RUN gem install bundler

# install gems
COPY Gemfile* $INSTALL_PATH/
RUN bundle install --without development test

# install yarn packages
COPY package.json yarn.lock $INSTALL_PATH/
RUN yarn install --check-files
RUN mv $INSTALL_PATH/node_modules /tmp/node_modules

# copy all code over
COPY . $INSTALL_PATH
RUN rm -rf $INSTALL_PATH/node_modules
RUN mv /tmp/node_modules $INSTALL_PATH/node_modules

# NOTE: Uncomment to run as non-root user (part #2)
#RUN chown -R $USER_NAME:$USER_NAME $INSTALL_PATH
#USER $USER_ID

#RUN rails webpacker:install
RUN SECRET_KEY_BASE=`RAILS_ENV=development bin/rake secret` bin/rails assets:precompile
CMD bundle exec rails s -b 0.0.0.0