adjust dokku app

Author: LordSimal

.github/workflows/deploy.yml

@@ -23,5 +23,6 @@ jobs:
         uses: dokku/github-action@master
         with:
           git_remote_url: 'ssh://[email protected]:22/book-vitepress'
+          branch: 'newbook'
           git_push_flags: '-f'
           ssh_private_key: ${{ secrets.DOKKU_SSH_PRIVATE_KEY }}