Dockerfile

# syntax = docker/dockerfile:1

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=3.2.2
FROM registry.docker.com/library/ruby:$RUBY_VERSION as base

# Rails app lives here
WORKDIR /rails
ARG uid=1001
ARG gid=1001

# Set production environment
ENV RAILS_ENV="development" \
    BUNDLE_PATH="/usr/local/bundle" \
    BUNDLE_WITHOUT="development" \
    RAILS_SERVE_STATIC_FILES=true

# Throw-away build stage to reduce size of final image
FROM base as build

# Install packages needed to build gems
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y build-essential git libvips pkg-config postgresql libyaml-dev

# Add user
RUN groupadd simple &&\
    groupadd -g ${gid} app &&\
    useradd -m -g ${gid} -G simple -u ${uid} app

# Install application gems
COPY --chown=${uid}:${gid} Gemfile Gemfile.lock ./
RUN bundle install && \
    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
    bundle exec bootsnap precompile --gemfile

# Copy application code
ADD . .

# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/


# Final stage for app image
FROM base

# Install PostgreSQL client tools
RUN apt-get update && \
    apt-get install -y postgresql-client postgresql ca-certificates curl gnupg

# Install Node.js and Yarn
# RUN mkdir -p /etc/apt/keyrings
# RUN curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
# ENV NODE_MAJOR=20
# RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list
# RUN apt-get update && apt-get install nodejs -y

# Install packages needed for deployment
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y curl libvips && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Copy built artifacts: gems, application
COPY --from=build /usr/local/bundle /usr/local/bundle
COPY --from=build /rails /rails

# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN ./bin/rails assets:precompile

# Run and own only the runtime files as a non-root user for security
# RUN useradd rails --create-home --shell /bin/bash && \
#     chown -R rails:rails db log storage tmp
# USER rails:rails

# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]

# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
CMD ["./bin/rails", "server"]