fix(ci): before script broken

.gitlab-ci.yml

@@ -9,14 +9,13 @@ before_script:
   - apk update
   - apk add nodejs npm
   - apk add yarn
+  - export TAG=${CI_COMMIT_TAG:-latest}
 
 
 build:
   stage: build
   services:
     - docker:18.09.6-dind
-  before_script:
-    - export TAG=${CI_COMMIT_TAG:-latest}
   script:
     - ./build.sh
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.e-biz.fr