Add sg doctor check for git version. (!29848) · Merge requests · Administrator / sourcegraph

Administrator requested to merge vg/sg-check-git into main Jan 18, 2022

Created by: varungandhi-src

It's easy to run into a mysterious gitserver failure when running sg start because of an outdated Git. Example: https://sourcegraph.slack.com/archives/C07KZF47K/p1642491532171300

On macOS, Xcode CommandLineTools include Git 2.30.1 whereas we need 2.34.1 or newer.

Add sg doctor check for git version.