You are. Use at your own risk. Alternately you can set up a GitHub token and use that instead.
Ideally this would be done using ssh and post-receive hooks on your hosted GitLab, but with the goal being to automate my hobby workflow, spinning up my own GitLab seemed excessive.
If you have an alternative for automatically mirroring to GitHub, I would absolutely love to hear it.
Other options I've used are:
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