chore: Add scripts/gen-release-notes.sh

This script is used to generate release notes for a feature.

However, currently New Contributors is not displayed correctly, so it has been
added but not used.

scripts/gen-release-notes.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+# exmaple:
+# scripts/gen-release-notes.hs [feature-name] x.y.z x.y.z-1
+
+FEATURE="${1}"
+TAG="feature_${FEATURE}_${2}"
+PREV_TAG="feature_${FEATURE}_${3}"
+test -n "${FEATURE}" || { echo "Missing feature name"; exit 1; }
+
+# この方法は New Contributors の整合性がとれない.
+# コミットはするが一旦保留。
+gh api \
+  --method POST \
+  -H "Accept: application/vnd.github+json" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  '/repos/{owner}/{repo}/releases/generate-notes' \
+  -f tag_name="${TAG}"\
+ -f target_commitish='main' \
+ -f previous_tag_name="${PREV_TAG}" \
+ -f configuration_file_path=".github/release-${FEATURE}.yml" \
+ -q ".body" \
+ | sed '/^### Exclude from changelog/,/^### /{//!d}'  | grep -v -e "^### Exclude from changelog"
+