Dockerfile

FROM ruby:3.2.2-slim-buster

# Common dependencies
RUN apt-get update -qq \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    build-essential \
    gnupg2 \
    curl \
    less \
    git \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

# Configure bundler
ENV LANG=C.UTF-8 \
  BUNDLE_JOBS=4 \
  BUNDLE_RETRY=3 \
  RAILS_ENV=production

# Upgrade RubyGems and install required Bundler version (see Gemfile.lock)
RUN gem update --system && \
    gem install bundler:2.4.20

# Create a directory for the app code
COPY . /app
WORKDIR /app

# Native requirements
RUN apt-get update -qq \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    libmariadb-dev-compat libmariadb-dev \
    libsqlite3-dev \
    nodejs \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

RUN bundle config without development test
RUN bundle install

RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile

CMD bundle exec rails server -b 0.0.0.0 -p 3000 -e production