Add cloudify_server script for demo quick start

We removed VmHost pages from UI at bc3c74a. Adding VmHost requires
multiple steps via CLI, and it makes quick start guide harder and longer.

Open source users can run `cloudify_server` script with following command

    docker exec -it ubicloud-app ./demo/cloudify_server

Script asks some inputs and guides users. Example interaction:

    Enter hostname or IP address: 138.201.228.121

    1. Hetzner Finland
    2. Hetzner Germany
    3. DataPacket Istanbul

    Select provider and location [default: 1]: 2

    Cloudifying '138.201.228.121' server for 'Hetzner Germany'

    Waiting public SSH keys

    Add following public SSH key to '/root/.ssh/authorized_keys' on your machine

    ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDcObAjJD70wSWGl4TSYk0Rz26b76vwcDtnY5FX6gJgP

    Press enter after you add the above SSH key to your machine

    Waiting for server to be cloudified
    2023-07-25 12:30:05 +0000 state: wait_bootstrap_rhizome
    2023-07-25 12:30:19 +0000 state: wait_prep
    2023-07-25 12:30:42 +0000 state: wait_setup_hugepages
    2023-07-25 12:31:56 +0000 state: wait_setup_spdk

    Your server is cloudified now. You can create virtual machines at 'Hetzner Germany' in the cloud dashboard.

If something went wrong, it timeouts in 10minutes with following message

    Could not cloudify server in 10 minutes. Probably something went wrong.
    Last state: wait_bootstrap_rhizome. Server ID for debug: b61f38d3-8bb1-8331-a264-f3ed899e3d4c
    Please check your hostname/IP address and be sure that you added the correct public SSH key to your server.
    You can ask for help on GitHub discussion page: https://github.com/ubicloud/ubicloud/discussions

.dockerignore

@@ -1,4 +1,5 @@
 .git
+.env
 .env.rb
 coverage
 demo/.env

demo/cloudify_server

@@ -0,0 +1,87 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+REPL = true
+
+require_relative "../loader"
+require "timeout"
+
+LOCATIONS = Option::Locations.map { |l| [l.name, "#{l.provider.display_name} #{l.display_name}"] }.to_h
+
+def get_input(msg, default = nil)
+  prompt = "#{msg}#{default.nil? ? "" : " [default: #{default}]"}: "
+  input = ""
+
+  while input.empty?
+    print prompt
+    input = gets.chomp
+    input = default if input.empty? && !default.nil?
+  end
+
+  input
+end
+
+def select_option(msg, options, default = nil)
+  puts "\n"
+  options.each_with_index { |(key, name), index| puts "#{index + 1}. #{name}" }
+  puts "\n"
+
+  prompt = "#{msg}#{default.nil? ? "" : " [default: #{default}]"}: "
+  selected = nil
+
+  while selected.nil?
+    print prompt
+    option = gets.chomp
+    option = if option.empty?
+      default
+    elsif option.to_i < 1
+      puts "Plese enter a number between 1-#{options.count}#{default.nil? ? "" : " or leave empty for default"}"
+    else
+      option.to_i
+    end
+
+    selected = options.keys[option - 1] unless option.nil?
+  end
+
+  selected
+end
+
+hostname = get_input("Enter hostname or IP address")
+location = select_option("Select provider and location", LOCATIONS, 1)
+
+puts "\n\nCloudifying '#{hostname}' server for '#{LOCATIONS[location]}' \n\n"
+
+strand = Prog::Vm::HostNexus.assemble(hostname, location: location)
+
+puts "Waiting public SSH keys\n\n"
+until (ssh_key = strand.reload.sshable.keys.map(&:public_key).first)
+  sleep 2
+end
+puts "Add following public SSH key to '/root/.ssh/authorized_keys' on your machine\n\n"
+puts ssh_key
+
+print "\n\nPress enter after you add the above SSH key to your machine\n\n"
+gets.chomp
+
+begin
+  Timeout.timeout(10 * 60) do
+    puts "Waiting for server to be cloudified"
+    previous_state = nil
+    while (state = strand.reload.label) != "wait"
+      if previous_state != state
+        puts "#{Time.now} state: #{state}"
+        previous_state = state
+      end
+      sleep 2
+    end
+  end
+rescue Timeout::Error
+  puts "\n\n"
+  puts "Could not cloudify server in 10 minutes. Probably something went wrong."
+  puts "Last state: #{strand.label}. Server ID for debug: #{strand.id}"
+  puts "Please check your hostname/IP address and be sure that you added the correct public SSH key to your server."
+  puts "You can ask for help on GitHub discussion page: https://github.com/ubicloud/ubicloud/discussions"
+  exit 1
+end
+
+puts "\n\nYour server is cloudified now. You can create virtual machines at '#{location}' in the cloud dashboard."

loader.rb

@@ -11,7 +11,7 @@ REPL = false unless defined? REPL
 Unreloader = Rack::Unreloader.new(
   reload: Config.development?,
   autoload: true,
-  logger: if Config.development?
+  logger: if Config.development? && !REPL
             require "logger"
             Logger.new($stdout)
           end