Add tooling to generate ChangeLogs

Gemfile

@@ -13,3 +13,8 @@ group(:development, optional: true) do
   gem 'pry'
   gem 'pry-byebug'
 end
+
+group(:release, optional: true) do
+  gem 'faraday-retry', require: false
+  gem 'github_changelog_generator', require: false
+end

Rakefile

@@ -3,3 +3,28 @@ require "bundler/gem_tasks"
 Dir.glob(File.join('tasks/**/*.rake')).each { |file| load file }
 
 task default: :spec
+
+begin
+  require 'github_changelog_generator/task'
+  require_relative 'lib/puppetserver/ca/version'
+
+  GitHubChangelogGenerator::RakeTask.new :changelog do |config|
+    config.header = <<~HEADER.chomp
+    # Changelog
+
+    All notable changes to this project will be documented in this file.
+    HEADER
+    config.user = 'openvoxproject'
+    config.project = 'openvoxserver-ca'
+    config.exclude_labels = %w[dependencies duplicate question invalid wontfix wont-fix modulesync skip-changelog]
+    config.future_release = Puppetserver::Ca::VERSION
+    config.since_tag = '2.7.0'
+  end
+rescue LoadError
+  task :changelog do
+    abort("Run `bundle install --with release` to install the `github_changelog_generator` gem.")
+  end
+end
+
+desc 'Prepare for a release'
+task 'release:prepare' => [:changelog]