perf: run pre-clone steps concurrently when using -j/--jumbo#93
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perf: run pre-clone steps concurrently when using -j/--jumbo#93
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This PR improves performance when using
-j/--jumboto clone a large repo. Before cloning and creating a new branch, we need to (1) check that a branch with the same name doesn't already exist, (2) do a minimal shallow clone to determine the actual shallow date. Instead of doing these steps in sequence, we're now doing them in parallel using concurrent connections to GitHub. This speeds up cloning Juju by 20-25%.