Extract only the current release notes for the chart content

.github/cr.yaml

@@ -3,4 +3,4 @@
 sign: true
 # UID of the GPG key to use
 key: "[email protected]"
-release-notes-file: CHANGELOG.md
+release-notes-file: RELEASE-NOTES.md

.github/workflows/release.yml

@@ -67,8 +67,7 @@ jobs:
       - name: Prepare for publish
         if: steps.changesets.outputs.hasChangesets == 'false'
         run: |
-          cp -f CHANGELOG.md charts/openproject/CHANGELOG.md
-
+          ruby script/extract-changeset
       - name: Publish
         if: steps.changesets.outputs.hasChangesets == 'false'
         uses: helm/[email protected]

.gitignore

@@ -1,4 +1,5 @@
 charts/openproject/charts
+charts/openproject/RELEASE-NOTES.md
 Chart.lock
 node_modules/
 .cr-gpg/

script/extract-changeset

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+require 'json'
+require 'yaml'
+
+changelog_file = File.expand_path('../CHANGELOG.md', __dir__)
+changelog = File.read changelog_file
+
+chart_file = File.expand_path('../charts/openproject/RELEASE-NOTES.md', __dir__)
+release_notes = changelog.split(/^## \d+\.\d+\.\d+$/)[1]
+
+puts "Writing to #{chart_file}:"
+puts release_notes
+
+File.open(chart_file, 'w') do |f|
+    f.write release_notes
+end
+