CI: add gems required in Ruby 4.0

Author: aramprice

.github/workflows/ruby.yml

@@ -15,4 +15,3 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
       - run: bundle install
       - run: bundle exec rspec spec/bat
-        continue-on-error: ${{ matrix.ruby == 'head' || matrix.ruby == '4.0' }}

Gemfile

@@ -1,12 +1,16 @@
-# encoding: UTF-8
 source 'https://rubygems.org'
 
 gem 'bosh_common'
 gem 'bosh-template'
+
+gem 'bcrypt_pbkdf'
 gem 'httpclient'
+gem 'ed25519'
+
+gem 'minitar'
 gem 'net-ssh'
 gem 'net-ssh-gateway'
-gem 'minitar'
+
 gem 'rspec'
-gem 'ed25519'
-gem 'bcrypt_pbkdf'
+gem 'logger' # Ruby 4.x
+gem 'ostruct' # Ruby 4.x - used by `bosh-template`