Toolkit: Fix bug with rootUrls not being properly parsed when signing a private plugin. (#43014) (#43081)

* fix plugin sign

* modify urls

* back to urls...

* code format

(cherry picked from commit e79254d9aa)

Co-authored-by: Dessen Xu <41524013+dessen-xu@users.noreply.github.com>

packages/grafana-toolkit/src/cli/index.ts

@@ -200,7 +200,21 @@ export const run = (includeInternalScripts = false) => {
   program
     .command('plugin:sign')
     .option('--signatureType <type>', 'Signature Type')
-    .option('--rootUrls <urls...>', 'Root URLs')
+    .option(
+      '--rootUrls <urls...>',
+      'Root URLs',
+      function (url: string, urls: string[]) {
+        if (typeof url !== 'string') {
+          return urls;
+        }
+
+        const parts = url.split(',');
+        urls.push(...parts);
+
+        return urls;
+      },
+      []
+    )
     .description('Create a plugin signature')
     .action(async (cmd) => {
       await execTask(pluginSignTask)({