test: add docusaurus deploy CI tests #7714
Draft
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Pre-flight checklist
Motivation
As mentioned in #7702, we don't have any automated way to ensure our deploy CLI keeps working over time, and any modification usually requires manual tests to ensure nothing gets broken.
These CLI scripts are not really easy to test as they usually run multiple complex Git commands.
I suggest we run as part of our CI tests to deploy a build dir to a real Git repo branch, ensuring at least the "happy path" of that script keeps working over time.
Test Plan
CI