Dockerfile


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# 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:$RUBY_VERSION-slim as base
FROM registry.docker.com/library/ruby:$RUBY_VERSION-alpine3.18 as base

# Rails app lives here
WORKDIR /rails

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


# 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
RUN apk add --update --no-cache build-base git vips postgresql-libs postgresql-dev tzdata

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

# Copy application code
COPY . .

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


# 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 && \
#    rm -rf /var/lib/apt/lists /var/cache/apt/archives
RUN apk add --update --no-cache curl vips postgresql-client

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

# Run and own only the runtime files as a non-root user for security
#RUN useradd rails --create-home --shell /bin/bash && \
RUN adduser rails --disabled-password --shell /bin/ash && \
    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"]