corrects git clone strategy

.gitlab-ci.yml

 variables:
     GIT_STRATEGY: "none"
-    GIT_SUBMODULE_STRATEGY: "recursive"
 
 stages:
     - build
@@ -8,6 +7,9 @@ stages:
 
 build:
     stage: build
+    variables:
+        GIT_STRATEGY: "clone"
+        GIT_SUBMODULE_STRATEGY: "recursive"
     script:
         - ./scripts/composer.sh config -g store-auths false
         - ./scripts/composer.sh config http-basic.git-t3o.typo3.org ${GIT_USER_NAME} ${GIT_PASSWORD}