Update .gitlab-ci.yml

.gitlab-ci.yml

+deploy_staging:
+  stage: deploy
+  script:
+    - echo "Deploy to staging server"
+  environment:
+    name: staging
+    url: https://staging.example.com
+
 pages:
   stage: deploy
-  script: mv src public
+  script:
+  - mkdir .public
+  - cp -r * .public
+  - mv .public public
   artifacts:
-     paths:
-       - public
+    paths:
+    - public
   only:
-    - main
+  - main
+