vendir capable of sync'ing files to its current-working-directory

[caphrim007]

Describe the problem/challenge you have
[A description of the current challenge that you are experiencing.]
i want to compose together a single repo using bits from other repos.

Among those other bits are top-level files like .pre-commit-config.yaml, .tflint, .isort, etc

Describe the solution you'd like
[A clear and concise description of what you want to happen. If applicable a visual representation of the UX.]
When I read the spec of vendir, intuitively it seems like vendir would support this.

for instance,

directories:
- path: .
  contents:
    - path: README
      git:
        url: git@github.com:org/repo.git
        ref: c26b9b
      includePaths:
        - README.md

However, when I provide it such a config, I get the following.

Error: Parsing resource config 'vendir.yml': Unmarshaling config: Validating config:
Validating directory '.' (1): Expected path to not be one of '/', '.', '..', ''

I think the current assumption for the feature-set of the product is that vendir assumes control of everything in its CWD, so supporting something like this would cause it to stomp on existing files or something.

Anything else you would like to add:
[Additional information that will assist in solving the issue.]

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