New changelog scripts (#4491)

* Add templates

* Add folder for local storage of the digests

* Add first draft of the changelog scripts

* Enable Audits in the change template

* Fixes for Polkadot

* Fix templating issue in case there is no high prio change

* Fix Ruby setup

* Remove shell

* Fix chain names

* Fix ENV

* Fix how to get runtime

* Fix runtime_dir

* Fix context location

* Pin changelogerator to a specific version

polkadot/scripts/changelog/test/test_basic.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require_relative '../lib/changelog'
+require 'test/unit'
+
+class TestChangelog < Test::Unit::TestCase
+  def test_get_dep_ref_polkadot
+    c = SubRef.new('paritytech/polkadot')
+    ref = '13c2695'
+    package = 'sc-cli'
+    result = c.get_dependency_reference(ref, package)
+    assert_equal('7db0768a85dc36a3f2a44d042b32f3715c00a90d', result)
+  end
+
+  def test_get_dep_ref_invalid_ref
+    c = SubRef.new('paritytech/polkadot')
+    ref = '9999999'
+    package = 'sc-cli'
+    assert_raise do
+      c.get_dependency_reference(ref, package)
+    end
+  end
+end