nactions/nix

This action is obsolete. Do not use it in new workflows.

Use explicit Attic setup in each repository that needs cache access:

- name: Setup Attic cache
  uses: ryanccn/attic-action@v0
  with:
    endpoint: ${{ secrets.ATTIC_ENDPOINT }}
    cache: ${{ secrets.ATTIC_CACHE }}
    token: ${{ secrets.ATTIC_TOKEN }}

Then run the repository's Nix build and check commands directly in the workflow.