fix: PR_DESCRIPTION_PREFIXの末尾に改行がない場合に追加する (#2300)

* fix: PR_DESCRIPTION_PREFIXの末尾に改行がない場合に追加する

* format修正 (#2301)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* 改行を増やす

* format修正 (#2302)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: massongit

dist/generate_title_description.js

@@ -16,6 +16,10 @@ export function generateTitleDescription(): {
   let title = PR_TITLE_PREFIX;
   let body = process.env.PR_DESCRIPTION_PREFIX || "";
 
+  if (body !== "" && !body.endsWith("\n")) {
+    body += "\n\n";
+  }
+
   body += `本PR ( \`${escapedHead}\` ) をマージすると差分が次のPRに反映されます。\n`;
   body += "* ";