Automate release notes

.github/workflows/scripts/generate_release_notes.rb

@@ -0,0 +1,67 @@
+#!/usr/bin/ruby
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require 'date'
+require_relative '../../../lib/new_relic/version'
+
+class GenerateReleaseNotes
+  DIVIDER = '---'
+  SUPPORT_STATEMENT = <<~SUPPORT_STATEMENT
+  <Callout variant="important">
+    We recommend updating to the latest agent version as soon as it's available. If you can't upgrade to the latest version, update your agents to a version at most 90 days old. Read more about [keeping agents up to date](/docs/new-relic-solutions/new-relic-one/install-configure/update-new-relic-agent/).
+
+    See the New Relic Ruby agent [EOL policy](https://docs.newrelic.com/docs/apm/agents/ruby-agent/getting-started/ruby-agent-eol-policy/) for information about agent releases and support dates.
+  </Callout>
+  SUPPORT_STATEMENT
+
+  def build_metadata
+    changelog = File.read('CHANGELOG.md')
+    latest_entry = changelog.split('##')[1].prepend('##')
+    titles = latest_entry.scan(/^- \*{2}(.*?)\*{2}$/).flatten # Match strings between sets of '**'
+    metadata = Hash.new { |h, k| h[k] = [] }
+
+    titles.each do |t|
+      category = t.split(':').first
+      case category
+      when 'Feature'
+        metadata[:features] << t.delete_prefix('Feature: ')
+      when 'Bugfix'
+        metadata[:bugs] << t.delete_prefix('Bugfix: ')
+      when 'Security'
+        metadata[:security] << t.delete_prefix('Security: ')
+      end
+    end
+
+    return metadata, latest_entry
+  end
+
+  def build_release_content
+    metadata, latest_entry = build_metadata
+    frontmatter = <<~FRONTMATTER
+      #{DIVIDER}
+      subject: Ruby agent
+      date: #{Date.today}
+      version: #{NewRelic::VERSION::STRING}
+      downloadLink: https://rubygems.org/downloads/newrelic_rpm-#{NewRelic::VERSION::STRING}.gem
+      features: #{metadata[:features]}
+      bugs: #{metadata[:bugs]}
+      security: #{metadata[:security]}
+      #{DIVIDER}
+
+      #{SUPPORT_STATEMENT}
+      #{latest_entry}
+    FRONTMATTER
+  end
+
+  def write_filename
+    "ruby-agent-#{NewRelic::VERSION::STRING.tr('.', '-')}.mdx"
+  end
+
+  def write_output_file
+    File.write(write_filename, build_release_content)
+  end
+end
+
+GenerateReleaseNotes.new.write_output_file