# Reference: https://github.com/ryoppippi/dotfiles/blob/main/.github/actions/setup-nix/action.yaml
name: Setup Nix
description: Install Nix and cache the Nix store
runs:
  using: composite
  steps:
    - name: Allow unprivileged user namespaces
      if: runner.os == 'Linux'
      shell: bash
      run: sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0 2>/dev/null || true
    - name: Install Nix
      uses: nixbuild/nix-quick-install-action@9f63be77f412a248c9d9a65a4c82cf066cdf8f0c # v35
      with:
        nix_conf: |
          accept-flake-config = true
          max-jobs = auto
    - name: Cache Nix store
      uses: nix-community/cache-nix-action@7df957e333c1e5da7721f60227dbba6d06080569 # v7.0.2
      with:
        primary-key: nix-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('flake.lock') }}
        restore-prefixes-first-match: nix-${{ runner.os }}-${{ runner.arch }}-
        gc-max-store-size-linux: 4G