https://hub.docker.com/r/yhirano55/static-sinatra-example/
$ bundle install --path vendor/bundle -j4
$ bundle exec rackup
And then you can access http://localhost:9292
$ docker build . -t yhirano55/static-sinatra-example:latest
$ docker run --name static-sinatra-example -d -p 3000:3000 yhirano55/static-sinatra-example
And then you can access http://localhost:3000