[CI] Build wasm blob with srtool and include prop hashes and blobs in release notes (#1506)

* initial build-wasms commit

* fix wasm builds

* add caching and artifact upload

* test for git dir

* Revert "test for git dir"

This reverts commit 295e4655484691aed9162f479a87f09c1b1c9317.

* fix git version incompability

* attempt to fix caching

* Revert "fix git version incompability"

This reverts commit 1d22ffd26b7eff635c5abcc9bd04cb3c88629a1d.

* add kusama job

* use a build matrix for building runtimes

* combine build-wasms and publish draft release

* attempt to name runtimes according to version

* Revert "attempt to name runtimes according to version"

This reverts commit 82f7b4dc0aea995f2599293bba9f11b879f459e5.
Failed experiment

* name runtimes according to version #2

* fix asset path and name

* build wasms first, include prop hash

polkadot/scripts/github/generate_release_text.rb

@@ -4,6 +4,8 @@ require 'changelogerator'
 require 'git'
 require 'erb'
 require 'toml'
+require 'json'
+require_relative './lib.rb'
 
 version = ENV['GITHUB_REF']
 token = ENV['GITHUB_TOKEN']
@@ -61,14 +63,23 @@ release_priority = Changelog.highest_priority_for_changes(all_changes)
 rustc_stable = ENV['RUSTC_STABLE']
 rustc_nightly = ENV['RUSTC_NIGHTLY']
 
-polkadot_runtime = File.open(polkadot_path + '/runtime/polkadot/src/lib.rs') do |f|
-  f.find { |l| l =~ /spec_version/ }.match(/[0-9]+/)[0]
-end
-kusama_runtime = File.open(polkadot_path + '/runtime/kusama/src/lib.rs') do |f|
-  f.find { |l| l =~ /spec_version/ }.match(/[0-9]+/)[0]
-end
-westend_runtime = File.open(polkadot_path + '/runtime/westend/src/lib.rs') do |f|
-  f.find { |l| l =~ /spec_version/ }.match(/[0-9]+/)[0]
-end
+polkadot_runtime = get_runtime('polkadot', polkadot_path)
+kusama_runtime = get_runtime('kusama', polkadot_path)
+westend_runtime = get_runtime('westend', polkadot_path)
+
+# These json files should have been downloaded as part of the build-runtimes
+# github action
+
+polkadot_json = JSON.parse(
+  File.read(
+    ENV['GITHUB_WORKSPACE'] + '/polkadot-srtool-json/srtool_output.json'
+  )
+)
+
+kusama_json = JSON.parse(
+  File.read(
+    ENV['GITHUB_WORKSPACE'] + '/kusama-srtool-json/srtool_output.json'
+  )
+)
 
 puts renderer.result

polkadot/scripts/github/lib.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+# A collection of helper functions that might be useful for various scripts
+
+# Gets the runtime version for a given runtime.
+# Optionally accepts a path that is the root of the project which defaults to
+# the current working directory
+def get_runtime(runtime, path = '.')
+  File.open(path + "/runtime/#{runtime}/src/lib.rs") do |f|
+    f.find { |l| l =~ /spec_version/ }.match(/[0-9]+/)[0]
+  end
+end

polkadot/scripts/github/polkadot_release.erb

@@ -11,6 +11,12 @@ This release was tested against the following versions of `rustc`. Other version
 - <%= rustc_stable %>
 - <%= rustc_nightly %>
 
+WASM runtimes built with [srtool](https://gitlab.com/chevdor/srtool) using `<%= polkadot_json['rustc'] %>`.
+
+Proposal hashes:
+* `polkadot_runtime-v<%= polkadot_runtime %>.compact.wasm - <%= polkadot_json['prop'] %>`
+* `kusama_runtime-v<%= kusama_runtime %>.compact.wasm - <%= kusama_json['prop'] %>`
+
 <% unless misc_changes.empty? %>
 ## Changes