hello world app

Dockerfile

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+FROM ruby:2.5 as build-and-run
+
+WORKDIR /app
+EXPOSE 8080
+
+COPY . /app
+RUN bundle install
+
+CMD ["bundle", "exec", "rackup", "-p", "8080", "-o", "0.0.0.0", "-s", "puma"]

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+gem "puma"
+gem "sinatra"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    mustermann (1.0.3)
+    puma (3.12.0)
+    rack (2.0.6)
+    rack-protection (2.0.4)
+      rack
+    sinatra (2.0.4)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.4)
+      tilt (~> 2.0)
+    tilt (2.0.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  puma
+  sinatra
+
+BUNDLED WITH
+   1.16.3

app.rb

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+require 'sinatra/base'
+
+class App < Sinatra::Base
+  get "/" do
+    "hello world"
+  end
+end

config.ru

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+require File.expand_path('app', File.dirname(__FILE__))
+
+run App