Update .gitlab-ci.yml

.gitlab-ci.yml

+# The Docker image that will be used to build your app
+image: node:its
+# Functions that should be executed before the build script is run
+before_script:
+  - npm install
 pages:
-  stage: deploy
   script:
-  - mkdir .public
-  - cp -r * .public
-  - mv .public public
+    - npm run build
   artifacts:
     paths:
-    - public
-  only:
-  - main
+      # The folder that contains the files to be exposed at the Page URL
+      - public
+  rules:
\ No newline at end of file
+    # This ensures that only pushes to the default branch will trigger
+    # a pages deploy
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH