Merge branch 'merge/master/gitlab-remote-import' into 'master'

.gitlab-ci.yml: import from remote

See merge request !21

.gitlab-ci.yml

-stages:
-- generate
-- flake
-- cache
-
-generate-flake-ci:
-  stage: generate
-  script:
-  - nix run "git+https://gitlab.nixica.dev/haskell/flake-to-gitlab-ci?ref=refs/tags/0.2.4.1" > flake-ci-x86_64-linux.yml
-  artifacts:
-    paths:
-      - flake-ci-x86_64-linux.yml
-
-x86_64-linux-ci:
-  stage: flake
-  trigger:
-    include:
-      - artifact: flake-ci-x86_64-linux.yml
-        job: generate-flake-ci
-    strategy: depend
-
-cachix:
-  stage: cache
-  only:
-    refs:
-    - master
-    - cachix
-  script:
-  - nix-shell -p cachix --command "nix build github:srid/devour-flake -L --no-link --print-out-paths --override-input flake . | xargs cat | cachix push horizon"
+include:
+- remote: 'https://gitlab.horizon-haskell.net/gitlab/ci-templates/raw/master/default.yml'