Create Rack and Bootsnap application

.gitignore

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+/tmp/*
+!/tmp/.keep

Gemfile

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 # frozen_string_literal: true
 
 source 'https://rubygems.org'
+
+gem 'activesupport', '~> 6.0'
+gem 'bootsnap', '~> 1.4', require: false
+gem 'rack', '~> 2.2'

Gemfile.lock

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 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (6.0.3.3)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
+    bootsnap (1.4.8)
+      msgpack (~> 1.0)
+    concurrent-ruby (1.1.7)
+    i18n (1.8.5)
+      concurrent-ruby (~> 1.0)
+    minitest (5.14.2)
+    msgpack (1.3.3)
+    rack (2.2.3)
+    thread_safe (0.3.6)
+    tzinfo (1.2.7)
+      thread_safe (~> 0.1)
+    zeitwerk (2.4.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  activesupport (~> 6.0)
+  bootsnap (~> 1.4)
+  rack (~> 2.2)
 
 BUNDLED WITH
    2.1.2

config.ru

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+# frozen_string_literal: true
+
+# This file is used by Rack-based servers to start the application.
+
+require_relative 'config/environment'
+
+run Fedihub::Webapp.application

config/application.rb

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+# frozen_string_literal: true
+
+require_relative 'boot'
+
+# Require the gems listed in Gemfile.
+Bundler.require
+
+module Fedihub
+  module Webapp
+    class << self
+      attr_reader :application
+
+      def initialize!
+      end
+    end
+  end
+end

config/boot.rb

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+# frozen_string_literal: true
+
+Warning[:deprecated] = false
+
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__).freeze
+
+require 'bundler/setup' # Set up gems listed in the Gemfile.
+
+require 'bootsnap'
+
+cache_dir = File.join(File.expand_path('..', __dir__), 'tmp', 'cache').freeze
+
+env = ENV['RACK_ENV'].freeze
+
+development_mode = ['', nil, 'development'].include?(env)
+test_mode        = env == 'test'
+
+Bootsnap.setup(
+  cache_dir: cache_dir,
+  development_mode: development_mode,
+  load_path_cache: true,
+  autoload_paths_cache: true,
+  disable_trace: false,
+  compile_cache_iseq: test_mode,
+  compile_cache_yaml: true,
+)

config/environment.rb

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+# frozen_string_literal: true
+
+# Load the application.
+require_relative 'application'
+
+# Initialize the application.
+Fedihub::Webapp.initialize!