Repository access is commonly realized by either basic authentication or SSH key. The later one is more secure and in my opinion easier to realize and manage. Redine doesn't have this type of permission system for repository access. It's just a viewer of some type. For your Git repositories you need something different for creation and access control. There are two applications which come to my mind. The first is Gitolite and the second one is Gitea both of them you would have to install besides your Redmine installation.
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