ci: experimentation with nix

.nix:

  image: nixos/nix:2.24.9

  before_script:

  - apt-get -q update

  - env DEBIAN_FRONTEND=noninteractive apt-get -q -y install jekyll make ruby-jekyll-redirect-from ruby-jekyll-polyglot ruby-jekyll-sitemap po4a python3-yaml git

    - echo "experimental-features = nix-command flakes" >>/etc/nix/nix.conf

test:

  image: debian:stable-backports

  extends: .nix

  script:

    - make

    - make lint

    - nix build .#reproducible-website

    - cp -vr --dereference $(readlink -f result) output

    - mv output _site

  artifacts:

    paths:

      - _site/*

  environment:

    name: HTML

    url: 'https://$CI_PROJECT_NAMESPACE.pages.debian.net/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/_site/index.html'

    url: "https://$CI_PROJECT_NAMESPACE.pages.debian.net/-/$CI_PROJECT_NAME/-/jobs/$CI_JOB_ID/artifacts/_site/index.html"