Corrige .gitlab-ci-yml.

.gitlab-ci.yml

@@ -28,7 +28,7 @@ docker:
   stage: build
   tags: [dind]
   variables:
-    - IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
+    IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
   script:
     - docker build --tag "$IMAGE" .
     - docker run --rm "$IMAGE" build
@@ -40,7 +40,7 @@ pages:
   rules:
     - if: $CI_COMMIT_BRANCH == "master"
   variables:
-    - IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
+    IMAGE: "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
   script:
     - docker run --rm -v "$PWD/src:/src/ro" -v "$PWD/public:/public" "$IMAGE" build
   artifacts: