Update .gitlab-ci.yml file

.gitlab-ci.yml

-# This file is a template, and might need editing before it works on your project.
 # To contribute improvements to CI/CD templates, please follow the Development guide at:
 # https://docs.gitlab.com/ee/development/cicd/templates.html
 # This specific template is located at:
-# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Pages/HTML.gitlab-ci.yml
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Pages/Doxygen.gitlab-ci.yml
+
+default:
+  # Full project: https://gitlab.com/pages/doxygen
+  image: alpine
 
-# Full project: https://gitlab.com/pages/plain-html
 pages:
-  stage: deploy
-  environment: production
   script:
-    - mkdir .public
-    - cp -r ./doc/html/* .public
-    - rm -rf public
-    - mv .public public
+    - apk update && apk add doxygen
+    - doxygen ./doc/
+    - mv doc/html/ public/
+  environment: production
   artifacts:
     paths:
       - public
   rules:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+