Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -5,14 +5,5 @@
 # https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Pages/HTML.gitlab-ci.yml
 
 # Full project: https://gitlab.com/pages/plain-html
-pages:
-  stage: deploy
-  script:
-    - mkdir .public
-    - cp -r * .public
-    - mv .public public
-  artifacts:
-    paths:
-      - public
-  rules:
-    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+image: ruby:2.7
+