Ruby: 2.7.0
$ bundle install
$ rails s -p 3000
$ bundle exec rspec spec -f d
http://localhost:3000/news
http://localhost:3000/news?page=2
http://localhost:3000/news?url=<url>
$ docker build -t hackernews-be .
# run test
$ docker run -e RUBYOPT=-W0 -it --rm hackernews-be bundle exec rspec
# start server
$ docker run -it --rm -p 3000:3000 hackernews-be bundle exec rails s -b 0.0.0.0