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Summary
This PR increases the
git
clone depth, so that builds can proceed when multiple commits are pushed before a build runs.See, for example, https://travis-ci.org/yarnpkg/yarn/jobs/167023508#L121 for an example of the build failure.
Test plan
Not applicable.
Since this repository has a lot of commits, cloning with
depth 1 can cause builds to fail erroneously when the commit
to test is not available in the shallow clone.