[ci] Move render_release_notes.rb to docs

docs/render_release_notes.rb

@@ -0,0 +1,44 @@
+#!/usr/bin/env ruby
+
+# Renders the release notes for Github releases,
+# and prints them to standard output
+
+# Doesn't trim the header, which is done in shell
+
+# Args:
+# ARGV[0] : location of the file to render
+
+require "liquid"
+require "safe_yaml"
+
+# include some custom liquid extensions
+require_relative "../docs/_plugins/all_extensions"
+
+# explicitly setting safe mode to get rid of the warning
+SafeYAML::OPTIONS[:default_mode] = :safe
+
+# START OF THE SCRIPT
+
+unless ARGV.length == 1 && File.exists?(ARGV[0])
+  print "\e[31m[ERROR] In #{$0}: The first arg must be a valid file name\e[0m\n"
+  exit 1
+end
+
+release_notes_file = ARGV[0]
+
+# Make the script execute wherever we are
+travis_dir = File.expand_path File.dirname(__FILE__)
+
+liquid_env = {
+    # wrap the config under a "site." namespace because that's how jekyll does it
+    'site' => YAML.load_file(travis_dir + "/../docs/_config.yml"),
+    # This signals the links in {% rule %} tags that they should be rendered as absolute
+    'is_release_notes_processor' => true
+}
+
+
+to_render = File.read(release_notes_file)
+rendered = Liquid::Template.parse(to_render).render(liquid_env)
+
+
+print(rendered)