# Use the official Ruby image.
# https://hub.docker.com/_/ruby
FROM ruby:2.5

# Install production dependencies.
WORKDIR /usr/src/app
COPY Gemfile Gemfile.lock ./
ENV BUNDLE_FROZEN=true
RUN bundle install

# Copy local code to the container image.
COPY . .

# Service must listen to $PORT environment variable.
# This default value facilitates local development.
ENV PORT 8080

# Run the web service on container startup.
CMD ["ruby", "./app.rb"]