Dockerfile

FROM ruby:3.2.2-alpine3.17 AS base

# Create and define work directory
WORKDIR /opt/killswitch

# Install OS dependencies
RUN apk --update --no-cache add nodejs tzdata libpq

# Install Ruby dependencies
RUN gem update --system 3.4.1 && gem update --system

FROM base AS build

# Copy only the minimal required files
COPY . /opt/killswitch/

# Update system and install dependencies
RUN apk --update --no-cache add --virtual build-dependencies build-base git nodejs npm postgresql-dev

# Install Ruby gems
RUN bundle config set --local without 'development test' && bundle install && bundle binstubs --all

# Install NPM packages
RUN npm set progress=false && npm install --silent --production

# Precompile assets
RUN SECRET_KEY_BASE=__UNUSED_BUT_REQUIRED__ RAILS_ENV=production bundle exec rake assets:precompile

FROM base AS release

# Copy distribution files only
COPY . .
COPY --from=build /usr/local/bundle/ /usr/local/bundle/
COPY --from=build /opt/killswitch/public/assets/ /opt/killswitch/public/assets/

# Copy entrypoint script
COPY scripts/docker-entrypoint.sh /usr/local/bin
RUN chmod a+x /usr/local/bin/docker-entrypoint.sh

# Create user
RUN adduser -D -h /opt/killswitch -u 5000 killswitch && chown -R killswitch: /opt/killswitch

USER killswitch

HEALTHCHECK CMD curl --fail http://localhost:3000 || exit 1

# Execute entrypoint script
ENTRYPOINT ["docker-entrypoint.sh"]
CMD bundle exec puma -p $PORT -C config/puma.rb