Dockerfile.dev

# syntax = docker/dockerfile:1

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=3.3.0
FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base

# App lives here
ARG WORKDIR=/usr/app
WORKDIR ${WORKDIR}

# Set environment
ENV BUNDLE_PATH="/usr/local/bundle"

# 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 libpq-dev libvips pkg-config

# Install application gems
COPY Gemfile* .ruby-version ./
RUN bundle install && \
  rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git

# Copy application code
COPY . .

# Final stage for app image
FROM base

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

# Copy built artifacts: gems, application
COPY --from=build $BUNDLE_PATH $BUNDLE_PATH
COPY --from=build $WORKDIR $WORKDIR

# Run and own only the runtime files as a non-root user for security
RUN useradd testuser --create-home --shell /bin/bash && \
  chown -R testuser:testuser $BUNDLE_PATH
USER testuser:testuser

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

# Start the server by default, this can be overwritten at runtime
EXPOSE 3000

CMD ["./bin/rails", "server", "-b", "0.0.0.0"]