Revert "Removed support for `single-branch` clones."
Revert "Removed support for `single-branch` clones."

This reverts commit 4ca9ec1be8c0dbb88271d5129883180e7c68566f.

Shopify/agent,buildkite/agent,buildkite/agent,buildkite/agent,Shopify/agent,grosskur/agent,Shopify/agent,grosskur/agent,grosskur/agent