## Changes
This change allows the `sync` command to work from [git
worktrees](https://git-scm.com/docs/git-worktree).
## Tests
* Added unit tests for traversal of worktree related files.
* Manually confirmed that synchronization of files from a main checkout,
as well as a worktree, observed the same ignore rules (both locally
defined as well as from `$GIT_DIR/info/exclude`).
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Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>
Stephen Macke