name: install-nix
description: Install Nix with flakes enabled and pre-warm the repository's flake devShell
runs:
  using: composite
  steps:
    - name: Install Nix (with flakes)
      uses: cachix/install-nix-action@v31
      with:
        extra_nix_config: |
          experimental-features = nix-command flakes
    - name: Pre-warm flake devShell
      run: |
        # Use the repository's `flake.nix` devShell to fetch dependencies.
        # This speeds up later `nix develop` invocations in workflow steps.
        nix develop --command true
      shell: bash