name: 'Initialize CI Environment and Repository'
description: 'Initialize a CI environment with nix (and also checkout the repository recursively with LFS)'
runs:
  using: "composite"
  steps:
    - name: Setup NIX CI Environment
      run: |
        echo "substituters = https://nixpkgs-cache.qo.is?priority=39" >> /etc/nix/nix.conf
        echo "trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" >> /etc/nix/nix.conf
        nix profile install nixpkgs#git-lfs nixpkgs#gnused
        mkdir -p ~/.config/nix && cp /etc/nix/nix.conf ~/.config/nix/

    - name: Checkout Repository
      shell: "nix shell nixpkgs#git-lfs nixpkgs#gnused --command {0}"
      run: |
        git lfs install
        git config --global credential.helper store
        AUTH_URL=`echo -n "$GITHUB_SERVER_URL" | sed "s%https://%https://oauth2:$GITHUB_TOKEN@%"`
        # Disable clone protection to pull LFS as well
        GIT_CLONE_PROTECTION_ACTIVE=false git clone --branch $GITHUB_REF_NAME --recurse-submodules $AUTH_URL/$GITHUB_REPOSITORY .