moves composer configuration to build task

.gitlab-ci.yml

 variables:
     GIT_STRATEGY: "none"
 
-before_script:
-    - composer config -g store-auths false
-    - composer config http-basic.git-t3o.typo3.org ${GIT_USER_NAME} ${GIT_PASSWORD}
-
 stages:
     - init
     - build
@@ -27,6 +23,8 @@ init:
 build:
     stage: build
     script:
+        - ./scripts/composer.sh config -g store-auths false
+        - ./scripts/composer.sh config http-basic.git-t3o.typo3.org ${GIT_USER_NAME} ${GIT_PASSWORD}
         - ./scripts/composer.sh install
     artifacts:
         paths: