Avoid initializing nested Git repository #2285
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Previously a Git repository was initialized if a Cargo workspace was detected. However, it's also possible for users to initialize rustlings in an existing Git repository that doesn't contain a Cargo workspace. In that case, it's still undesirable to initialize a nested Git repository for rustlings. We therefore call Git directly to determine if rustlings is being initialized in an existing Git repository.
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Previously a Git repository was initialized if a Cargo workspace was detected. However, it's also possible for users to initialize rustlings in an existing Git repository that doesn't contain a Cargo workspace. In that case, it's still undesirable to initialize a nested Git repository for rustlings. We therefore call Git directly to determine if rustlings is being initialized in an existing Git repository.