Dockerfile.dev

# syntax=docker/dockerfile:1

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version or your desired version
ARG RUBY_VERSION=3.4.4
FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base

# Rails app lives here
WORKDIR /rails

# Install base packages & sqlite3
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y curl libjemalloc2 libvips sqlite3 && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Set development environment
ENV RAILS_ENV="development" \
    BUNDLE_PATH="/usr/local/bundle"
    # BUNDLE_WITHOUT is not set, to include development and test gems

# Throw-away build stage to reduce size of final image (optional for dev, but good practice)
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 libyaml-dev pkg-config && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Install application gems
COPY Gemfile Gemfile.lock ./
RUN bundle install && \
    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
    # bootsnap precompile for gemfile can be kept or removed for dev
    # RUN bundle exec bootsnap precompile --gemfile

# Copy application code
COPY . .

# bootsnap precompile for app/lib is usually for production, can be skipped for dev
# RUN bundle exec bootsnap precompile app/ lib/

# Asset precompilation is usually for production, skipped for dev (assets served dynamically)
# RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile

# Final stage
FROM base

COPY --from=build /usr/local/bundle /usr/local/bundle
COPY --from=build /rails /rails

# Expose port 3000 to the Docker host, so we can access it
# from the outside.
EXPOSE 3000

# The main command to run when the container starts.
CMD ["bin/rails", "server", "-b", "0.0.0.0"]