Allow to configure paths to skip when uploading

[istudyatuni]

I want to configure "magic"

For example, to ignore final build artifact, which won't be needed anymore. Something like this:

jobs:
  build:
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      id-token: write
    steps:
      - uses: actions/checkout@v4
      - uses: DeterminateSystems/nix-installer-action@main
      - uses: DeterminateSystems/magic-nix-cache-action@main
        with:
          skip_upload: |
            some_path
            another_path
      - run: nix build

some_path is a part of full /nix/store/[hash]-some_path-... path, e.g. it will be matched like nix_path.file_name().unwrap().contains("some_path")