Dockerfile

# 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

# 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 pkg-config nodejs libpq-dev

# 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

# Create a revision file for shipit
RUN bundle info shipit-engine --version > REVISION

# Copy application code
COPY . .

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

# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile


# 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 libsqlite3-0 nodejs libpq-dev jq git make && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

RUN curl -L https://downloads-openshift-console.apps.silver.devops.gov.bc.ca/amd64/linux/oc.tar | tar x -C /bin
RUN curl -L https://get.helm.sh/helm-v3.14.4-linux-amd64.tar.gz | tar xz -C /bin --strip-components 1


# 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
# Default shipit setup not suitable for openshift
# RUN useradd rails --create-home --shell /bin/bash && \
#     chown -R rails:rails db log storage tmp 
# USER rails:rails

RUN useradd -r -u 1001 -g root nonroot
RUN chown -R nonroot:0 /rails && \
    chmod -R g=u /rails
RUN chown -R nonroot:0 /usr/local/bundle && \
    chmod -R g=u /usr/local/bundle

USER nonroot

# Helm needs to write a few directories in the HOME of the user
ENV HOME="/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"]