Add diver_down_web to run web server

diver_down.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
     Dir['lib/**/*'] + Dir['web/**/*'] + ['README.md', 'LICENSE.txt', 'CHANGELOG.md']
   end
   spec.bindir = 'exe'
-  spec.executables = []
+  spec.executables = ['diver_down_web']
   spec.require_paths = ['lib']
 
   spec.add_dependency 'activesupport', '>= 7.0.0'

exe/diver_down_web

@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'bundler/setup'
+require 'rackup'
+require 'webrick'
+require 'diver_down'
+require 'diver_down-web'
+
+Rackup::Server.new(
+  app: DiverDown::Web.new(definition_dir: ENV.fetch('DIVER_DOWN_DIR'))
+).start