Allow disabling Git protocols for specific Git operations

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I manage a gitlab installation exposed to the internet that for a bunch of reasons is not reachable over HTTPS. For that reason I disabled login via regular passwords, and also disabled git access via HTTP, to avoid people sending their password over plain http.

That said, I would like a way to retain un-authenticated HTTP access to public repositories (therefore "fetch only"), so not to force people to need a registered SSH key for all the hosts a repository might be cloned.