Update cache key config

.gitlab-ci.yml

@@ -1,7 +1,5 @@
 image: docker:dind
 
-cache:key: 2
-
 variables:
   CONTAINER_TEST_IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
   CONTAINER_RELEASE_IMAGE: "$CI_REGISTRY_IMAGE:latest"
@@ -19,6 +17,8 @@ build:
   script:
     - docker build --pull -t "$CONTAINER_TEST_IMAGE" .
     - docker push "$CONTAINER_TEST_IMAGE"
+  cache:
+    key: 2
 
 release-image:
   stage: release