Update .gitlab-ci.yml

.gitlab-ci.yml

-image: alpine:latest
-
-pages:
-  stage: deploy
-  script:
-  - echo 'Nothing to do...'
-  artifacts:
-    paths:
-    - Build/WebGL/ToTheSurface
-  only:
-  - master
+image: alpine:latest
+
+pages:
+  stage: deploy
+  script:
+  - mkdir .public
+  - cp -r Build/WebGL/ToTheSurface/* .public
+  - mv .public public
+  artifacts:
+    paths:
+    - public
+  only:
+  - master