Describe the problem/challenge you have
Currently, vendir takes long time to clone a repository. If I am after files from a specific branch it takes long time and it downloads unnecessary stuff I don't care about.

Describe the solution you'd like

Add an option to

• specify cloning depth
• only clone single branch

apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: docs/modules
  contents:
  - path: ROOT/partials
    git:
      url: https://github.com/openshift/openshift-docs
      ref: rhacs-docs
      single-branch: true
      depth: 1
    includePaths:
    - modules/*
    newRootPath: modules/

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