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Well, looks like "sync with github" is also enough since it needs your github account authenticated. It just needs to be a required step.

Currently we have the possibility of linking the account to GitHub and it doesn't seem to be sufficient, so to be honest I don't really see how that will be much different - although I agree that this probably should be a sufficient proof of ownership.
I wanted to suggest an alternative in case it would be simpler to implement.

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