ci: add workflow_dispatch trigger to check-getting-started

.github/workflows/check-getting-started.yml

@@ -29,6 +29,7 @@ on:
     types: [opened, synchronize, reopened, ready_for_review]
   schedule:
     - cron: "0 5 * * *"
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}