Pip cache not downloading

[#1]

I am trying to use the pip cache in my pipeline:

      - step:

          name: build

          runs-on:

            - 'self.hosted'

            - 'windows'

          caches:

            - pip

          script:

            - .\build.ps1 # Contains a 'pip install' step

      

On setup I keep getting:

Cache "pip": Downloading

Cache "pip": Not found

On a successful build I see:

Cache "pip": Skipping upload for empty cache

The cache documentation mentions ~/.cache/pip as the cache folder for a pip cache. It makes no mention of windows which has it here: $ENV:LOCALAPPDATA\pip\cache\