ci: fix post build script

Author: js2me

post-build.mjs

@@ -32,7 +32,7 @@ postBuildScript({
       });
 
       if (process.env.CI) {
-        if (publishOutput.publishedGitTag) {
+        if (publishOutput?.publishedGitTag) {
           const { whatChangesText } = getInfoFromChangelog(
             nextVersion,
             path.resolve(targetPackageJson.locationDir, '../CHANGELOG.md'),