docs/serving/samples/helloworld-ruby/Dockerfile

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Docker

# 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"]