chore(ci): fixed release notification action; (#6063)

bin/actions/notify_published.js

@@ -1,18 +1,24 @@
 import minimist from "minimist";
 import RepoBot from '../RepoBot.js';
+import fs from 'fs/promises';
 
 const argv = minimist(process.argv.slice(2));
 console.log(argv);
 
-const tag = argv.tag;
-
-if (!tag) {
-  throw new Error('tag must be specified');
-}
-
-const bot = new RepoBot();
+let {tag} = argv;
 
 (async() => {
+  if (!tag || tag === true) {
+    const {version} = JSON.parse((await fs.readFile('./package.json')).toString());
+
+    tag = 'v' + version;
+  } else if (typeof tag !== 'string') {
+
+    throw new Error('tag must be a string');
+  }
+
+  const bot = new RepoBot();
+
   try {
     await bot.notifyPublishedPRs(tag);
   } catch (err) {