git: restrict definition of git ref to previous behavior #4849
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Fixes #4777 (again - thanks @raylu), and fixes #4846. See where this regression was introduced: https://github.com/moby/buildkit/pull/4142/files#diff-1bb11d110027d34708083bbbd69dbd446eadf916857680c279a31038268163b6L59-L60
During git refactoring, git refs accidentally became significantly broader in definition - specifically, files like "foo.bar/test.git" - is this a git repo at "foo.bar", or a local git directory?
We need to restrict this a lot more, previously, we only did this clever conversion for the "github.com" prefix. This restores this previous behavior.