Use changelog for release notes

Author: Arlowen

.github/workflows/release.yml

@@ -46,10 +46,26 @@ jobs:
             sha256sum cloudcanal_*.tar.gz > checksums.txt
           )
 
+      - name: Generate release notes from CHANGELOG
+        run: |
+          set -euo pipefail
+          version="${GITHUB_REF_NAME#v}"
+          output="dist/release-notes.md"
+          awk -v version="$version" '
+            $0 ~ "^## \\[" version "\\]" { in_section = 1 }
+            /^## \[/ && in_section && $0 !~ "^## \\[" version "\\]" { exit }
+            in_section { print }
+          ' CHANGELOG.md > "$output"
+
+          if [[ ! -s "$output" ]]; then
+            echo "Release notes for version ${version} not found in CHANGELOG.md" >&2
+            exit 1
+          fi
+
       - name: Publish GitHub Release
         uses: softprops/action-gh-release@v2
         with:
           files: |
             dist/cloudcanal_*.tar.gz
             dist/checksums.txt
-          generate_release_notes: true
+          body_path: dist/release-notes.md