克隆单独分支
git clone --single-branch --branch <branchname> <remote-repo>
ref: https://stackoverflow.com/questions/1911109/how-do-i-clone-a-specific-git-branch
vs 拉取独立分支：
git checkout --track origin/daves_branch
ref: https://stackoverflow.com/questions/9537392/git-fetch-remote-branch
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