ci: add Page publishing

.gitlab-ci.yml

+stages:
+  - 📝 publish
+  - 🧽 clean
+
+variables:
+  SUB_GROUP: "compagnons-devops"
+  BASE_URL: "/${SUB_GROUP}/${CI_PROJECT_NAME}/"
+
+pages:
+  image: node:lts-bullseye-slim
+  stage: 📝 publish
+  script:
+    - npm install
+    - npm run build
+    - mv dist public
+  artifacts:
+    paths:
+      - public
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+  environment:
+    name: production
+    url: "https://${CI_PROJECT_ROOT_NAMESPACE}.${CI_PAGES_DOMAIN}/${SUB_GROUP}/${CI_PROJECT_NAME}/"