name: 'Nix Setup with Cache'
description: 'Install Nix and set up store caching'

inputs:
  cache-name:
    description: 'Optional cache name prefix for disambiguation'
    required: false
    default: ''

runs:
  using: 'composite'
  steps:
    - name: Install Nix
      uses: DeterminateSystems/nix-installer-action@main

    - name: Cache Nix store
      uses: actions/cache@v4
      with:
        path: |
          /nix/store
          /nix/var/nix
          ~/.cache/nix
        key: nix-${{ inputs.cache-name }}${{ runner.os }}-${{ hashFiles('flake.lock') }}
        restore-keys: |
          nix-${{ inputs.cache-name }}${{ runner.os }}-