If you encounter this issue:
remote: Permission to username/online.git denied to username
fatal: unable to access ‘https://github.com/username/online.git/’: The requested URL returned error: 403
or you just don’t want to give direct permission to Gitpod.
You can simply do:
git config --global --unset credential.helper
Use this command every time you rerun the Gitpod before pushing your changes to your forked repo.