Update .gitlab-ci.yml, works with existing paths

.gitlab-ci.yml

@@ -4,7 +4,7 @@ variables:
 pages-master:
   stage: deploy
   script:
-    - mkdir "$EXPORT_DIR/$CI_PROJECT_NAME"	
+    - mkdir -p "$EXPORT_DIR/$CI_PROJECT_NAME"	
     - cp -r public/* "$EXPORT_DIR/$CI_PROJECT_NAME"
   tags: 
     - production