Dockerfile

# This Dockerfile is designed for production, not development. Use with Kamal or build'n'run by hand:
# docker build -t my-app .
# docker run -d -p 80:80 -p 443:443 --name my-app -e RAILS_MASTER_KEY=<value from config/master.key> my-app

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
ARG RUBY_VERSION=4.0.4
FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base

ARG BUNDLER_VERSION=4.0.16
RUN gem install bundler -v "$BUNDLER_VERSION"

# Rails app lives here
WORKDIR /rails

# Install runtime packages
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y \
      curl \
      ffmpeg \
      libjemalloc2 \
      libvips \
      librsvg2-bin \
      postgresql-client && \
    rm -rf /var/lib/apt/lists/* /var/cache/apt/archives

# Set production environment
ENV RAILS_ENV="production" \
    BUNDLE_DEPLOYMENT="1" \
    BUNDLE_PATH="/usr/local/bundle" \
    BUNDLE_WITHOUT="development:test"

# ============================================================
# Build stage
# ============================================================

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 \
      pkg-config && \
    rm -rf /var/lib/apt/lists/* /var/cache/apt/archives

# Install application gems
COPY Gemfile Gemfile.lock ./

RUN bundle _${BUNDLER_VERSION}_ install && \
    rm -rf ~/.bundle/ \
      "${BUNDLE_PATH}"/ruby/*/cache \
      "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
    bundle exec bootsnap precompile --gemfile

# Copy application
COPY . .

# Precompile Bootsnap
RUN bundle exec bootsnap precompile app/ lib/


# ============================================================
# Final runtime image
# ============================================================

FROM base

# Copy built artifacts: gems, application
COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
COPY --from=build /rails /rails

# Run as non-root user
RUN groupadd --system --gid 1000 rails && \
    useradd rails \
      --uid 1000 \
      --gid 1000 \
      --create-home \
      --shell /bin/bash && \
    chown -R rails:rails db log storage tmp

USER 1000:1000

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

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

# Healthcheck for Coolify / Docker orchestrators
HEALTHCHECK --interval=10s --timeout=3s --start-period=30s --retries=3 \
  CMD curl -f http://127.0.0.1:3000/up || exit 1

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