rails-dockerfile-prod

FROM ruby:2.7.6 as builder
LABEL maintener='bpdarlyn@gmail.com'
LABEL description='example a docker production mode with builder'

ENV BUNDLER_VERSION 2.3.18
ENV BUNDLE_JOBS 8
ENV BUNDLE_RETRY 5
ENV BUNDLE_WITHOUT development:test
ENV BUNDLE_CACHE_ALL true
ENV RAILS_ENV production
ENV RACK_ENV production
ENV NODE_ENV production
ENV APP_PATH /app

RUN bash -c "set -o pipefail && apt-get update \
  && apt-get install -y --no-install-recommends build-essential curl git python2 tzdata \
  && curl -sSL https://deb.nodesource.com/setup_14.x | bash - \
  && curl -sSL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
  && echo 'deb https://dl.yarnpkg.com/debian/ stable main' | tee /etc/apt/sources.list.d/yarn.list \
  && apt-get update && apt-get install -y --no-install-recommends nodejs yarn \
  && rm -rf /var/lib/apt/lists/* /usr/share/doc /usr/share/man \
  && apt-get clean"

WORKDIR $APP_PATH

RUN gem install bundler -v 2.0.2
COPY Gemfile Gemfile.lock ./
RUN gem install bundler -v $BUNDLER_VERSION

RUN bundle config --global frozen 1 && \
  bundle install && \
  rm -rf /usr/local/bundle/cache/*.gem && \
  find /usr/local/bundle/gems/ -name "*.c" -delete && \
  find /usr/local/bundle/gems/ -name "*.o" -delete

  # NPM packages installation
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile --non-interactive --production

ADD . $APP_PATH

RUN rails assets:precompile --trace && \
  yarn cache clean && \
  rm -rf node_modules tmp/cache vendor/assets test

FROM ruby:2.7.6
ENV APP_PATH /app
ENV RAILS_ENV production
ENV NODE_ENV production
ENV RAILS_SERVE_STATIC_FILES true
WORKDIR $APP_PATH

COPY --from=builder /usr/lib /usr/lib
# Timezone data is required at runtime
COPY --from=builder /usr/share/zoneinfo/ /usr/share/zoneinfo/

# Ruby gems
COPY --from=builder /usr/local/bundle /usr/local/bundle

COPY --from=builder $APP_PATH $APP_PATH