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/templates/debug.md.tera

@@ -0,0 +1,10 @@
+{%- set to_ignore = changes | filter(attribute="meta.B.value", value=0) %}
+
+<!--
+## Debug
+
+changes:
+ - total: {{ changes | length }}
+ - silent: {{ to_ignore | length }}
+ - remaining: {{ changes | length - to_ignore | length }}
+-->