Update .gitlab-ci.yml file

.gitlab-ci.yml

-# The Docker image that will be used to build your app
-image: debian:bookworm
+stages:
+    - deploy
+
+pages:
+    stage: deploy
+    image: busybox:latest
+    script:
+        - mv ./* public/
+    artifacts:
+        paths:
+            - public
+        rules:
+            - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+            
\ No newline at end of file