Change default GIT_STRATEGY to clone

.gitlab-ci.yml

@@ -14,7 +14,7 @@ stages:
 
 variables:
   SECURE_LOG_LEVEL: "debug"
-  GIT_STRATEGY: "none"
+  GIT_STRATEGY: "clone"
   GIT_SSL_NO_VERIFY: "true"
   STAGE_HOST: "extensions.typo3.dev"
   PRODUCTION_PORT: 22
@@ -26,8 +26,6 @@ variables:
 test:unit:
   stage: test
   image: php:7.4
-  variables:
-    GIT_STRATEGY: "clone"
   before_script:
     - set -xe
     - apt-get update -yqq
@@ -51,8 +49,6 @@ test:unit:
 test:mutation:
   stage: test
   image: php:7.4
-  variables:
-    GIT_STRATEGY: "clone"
   allow_failure: true
   before_script:
     - set -xe
@@ -76,6 +72,8 @@ test:mutation:
     expire_in: 30 min
 
 mutation:badge:
+  variables:
+    GIT_STRATEGY: "none"
   stage: badges
   image: python:3.9
   allow_failure: true