include:
  - component: $CI_SERVER_FQDN/$CI_PROJECT_PATH/nix-gitlab-ci@$CI_COMMIT_SHA
stages:
  - build
  - trigger
build:image:
  stage: build
  parallel:
    matrix:
      - VARIANT: ["", "-cachix", "-attic"]
  image: nixpkgs/nix-flakes:latest
  before_script:
    - nix profile install nixpkgs#skopeo
    - export PATH="$PATH:$HOME/.nix-profile/bin"
  script:
    - nix build .#image${VARIANT}
    - export NORMALIZED_BRANCH=${CI_COMMIT_BRANCH/\//-}
    - skopeo --insecure-policy copy --dest-creds "${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}" --tmpdir /tmp "docker-archive:result" "docker://$CI_REGISTRY_IMAGE/nix-ci:${CI_COMMIT_SHORT_SHA}${VARIANT}"
    # branches
    - |
      if [ -z "$CI_COMMIT_TAG" ]; then
        skopeo --insecure-policy copy --dest-creds "${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}" --tmpdir /tmp \
          "docker-archive:result" \
          "docker://$CI_REGISTRY_IMAGE/nix-ci:${NORMALIZED_BRANCH/main/latest}${VARIANT}";
      fi
    # tags
    - |
      if [ -n "$CI_COMMIT_TAG" ]; then
        skopeo --insecure-policy copy --dest-creds "${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}" --tmpdir /tmp \
          "docker-archive:result" \
          "docker://$CI_REGISTRY_IMAGE/nix-ci:${CI_COMMIT_TAG}${VARIANT}";
      fi