rattler-build sometimes does recursive copies when using `path: ../`

[pavelzw]

When using

source:
  path: ../

and rattler-build build -r conda-recipe/recipe.yaml

rattler-build sometimes (this is maybe a race condition?) also copies output/ into the work folder when output/ is not in .gitignore. rattler-build should fail if the output directory is inside of source.path and not excluded by .gitignore.

Somewhat similar to #349